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Effects of Cognitive Learning Strategies for Korean Learners: A Meta-Analysis

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The purpose of this study was to synthesize the cognitive learning strategy intervention studies conducted in Korea between 1990 and 2006, using meta-analysis. By means of pre-established systematic criteria, 50 articles were selected and 97 effect sizes were calculated. Effect size was calculated using ‘the Cohen’s d’ (Cooper & Hedges, 1994). The research questions of the present study were as follows: (a) Are cognitive learning strategies generally effective? (b) What type of cognitive learning strategy is most effective? (c) Are effect sizes of different types of cognitive learning strategies different according to the applied domains, grade levels, and achievement levels? The results of the study indicate that, first of all, the overall cognitive learning strategies (97 ESs) yielded a large effect size (ESsm=.96), which was not homogenous (Q=55.19,p <.05). Thus, in each subcategory of learners’ characteristics and applied domains, we calculated effect sizes and conducted the test of homogeneity separately. Except for grade level, the effect sizes were generally homogenous in each subcategory. The findings revealed that cognitive strategies had large effect sizes (.82–1.69). For average achieving students as well as underachieving students (Learning Disabilities), cognitive learning strategies were very effective (.82–1.42). The effect of cognitive learning strategies was very large in terms of students in all grades (1.02–1.34), except for middle school students (.70). Lastly, the implications for the application of different cognitive learning strategies were discussed.
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Asia Pacific Education Review Copyright 2008 by Education Research Institute
2008, Vol. 9, No.4, 409-422.
409
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Dongil Kim, Associate Professor, College of Education, BK21
Academic Leadership Institute for Competency-based Education,
Seoul National University, Korea; Boong-nyun Kim, Assistant
Professor, College of Medicine, Seoul National University, Korea;
Kijyung Lee, Ph.D. candidate, College of Education, Seoul
National University, Korea; Joong-kyu Park, Assistant Professor,
College of Rehabilitation Science, Daegu University, Korea;
Sungdoo Hong, Kwangju Women’s University, Korea; Hyoungsoo
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Kim, Assistant Professor, Counseling Department, Luther University,
Korea.
This work was supported by the Korea Science and Engineering
Foundation (KOSEF) grant funded by the Korea government
(MEST) (No. R01-2008-000-20528-0)
Correspondence concerning this article should be addressed to
Hyoungsoo Kim, Sanggal-dong17, Giheung-gu, Yongin-si,
Gyeonggi-do, Korea (446-700). E-mail: hskim70@ltu.ac.kr
Effects of Cognitive Learning Strategies for Korean Learners:
A Meta-Analysis
Dongil Kim Boong-nyun Kim Kijyung Lee
Seoul National University
Korea
Joong-kyu Park Sungdoo Hong Hyoungsoo Kim
Daegu University Kwangju Women’s University Luther University
Korea
The purpose of this study was to synthesize the cognitive learning strategy intervention studies conducted in Korea
between 1990 and 2006, using meta-analysis. By means of pre-established systematic criteria, 50 articles were
selected and 97 effect sizes were calculated. Effect size was calculated using 'the Cohen's d' (Cooper & Hedges,
1994). The research questions of the present study were as follows: (a) Are cognitive learning strategies generally
effective? (b) What type of cognitive learning strategy is most effective? (c) Are effect sizes of different types of
cognitive learning strategies different according to the applied domains, grade levels, and achievement levels? The
results of the study indicate that, first of all, the overall cognitive learning strategies (97 ESs) yielded a large effect
size (ESsm=.96), which was not homogenous (Q=55.19, p< .05). Thus, in each subcategory of learners'
characteristics and applied domains, we calculated effect sizes and conducted the test of homogeneity separately.
Except for grade level, the effect sizes were generally homogenous in each subcategory. The findings revealed that
cognitive strategies had large effect sizes (.82-1.69). For average achieving students as well as underachieving
students (Learning Disabilities), cognitive learning strategies were very effective (.82-1.42). The effect of cognitive
learning strategies was very large in terms of students in all grades (1.02-1.34), except for middle school students
(.70). Lastly, the implications for the application of different cognitive learning strategies were discussed.
Key words: cognitive learning strategy, meta-analysis, academic achievementG
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Dongil Kim, Boong-nyun Kim, Kijyung Lee, Joong-kyu Park, Sungdoo Hong, Hyoungsoo Kim
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410
Introduction
Academic difficulties are generally regarded as the
most serious problem for children and adolescents in Korea.
Actually, many youngsters in Korea spend more time
worrying about their schoolwork and grades than any other
issue (Kim, 1998). Over the past decades, a considerable
number of studies have been conducted to help students
overcome academic problems or underachievement. Among
these previous studies, many correlates of both achievement
and underachievement were systematically examined,
including easy-to-control factors and hard-to-control factors.
Unlike the hard-to-control factors, such as intelligence and
personality, learning strategy, cognitive learning strategy in
particular, was perceived as one of the significant
‘controllable’ components for academic success.
Cognitive learning strategies which are composed of
‘elaborate strategy’, ‘organized strategy’, ‘meta-cognitive
strategy’, and ‘affective strategy’ (Weinstein & Mayer,
1986) are sometimes regarded as much the same as learning
strategy. What then is a learning strategy? Devine (1987)
defined ‘learning strategies’ or ‘study skills’ as
“competencies associated with acquiring, recording,
organizing, synthesizing, remembering, and using
information and ideas found in school” (p. 5). Kim (1986)
describes learning strategies as ‘the systematic procedures’
that students initiate to complete such complex tasks as
skimming, determining relevant information, taking notes,
and studying materials for a test. As stated already, learning
strategies also indicated the systematic techniques involving
the use of cognitive and metacognitive elements to respond
independently to specific tasks (Deshler & Schumaker,
1986; Ellis, Lenz, & Sabornie, 1987a; 1987b). There are also
different taxonomies for classification of learning strategies
(Dansereau, 1985; Pressley, 1986; Weinstein & Mayor,
1986; McKeachie et al., 1991).
Many studies (Bos & Anders, 1990; Swanson, 1993;
Swanson & Alexander, 1997; Stanovich & Siegel, 1994)
showed academic problems are significantly related to
learning strategy deficits, and found that learning strategy
plays a major role in academic performance. These previous
studies also showed that a great deal of evidence existed
that the students with academic difficulties lack the
organizational and study skills needed to respond to the task
demands of the regular classroom and that they experienced
difficulty in acquiring those skills. For example, Torgesen
(1977) has found that the students with academic difficulties
are not actively involved in learning and show deficiencies
in spontaneous use of learning strategies. They were passive
in their approach to classroom tasks (Torgesen, 1982).
Additionally, they often did not recognize the need for, or
know how to apply, a learned learning strategy in a new
situation (Chan & Cole, 1986).
According to the meta-analysis studies in the field of
learning problems, efforts to train students with learning
problems to use specific cognitive strategies to improve
learning have been successful. Swanson and McMahon
(1996) synthesized a total of 236-intervention research
studies published between 1963 and 1995 that exclusively
included students identified with learning disabilities (LD).
The results addressed the effects of interventions on array of
dependent measures including reading, math, writing, social
skills, creativity, and perceptual domain. This particular
study reported quantitative effect magnitude of learning
strategies using the meta-analysis method. The average
effect size was about .70. Swanson and Hoskyn (1998)
comprehensively synthesized experimental intervention
studies from 1963 to 1997 that included students identified
as LD. The effect sizes were calculated for 17 categories
such as reading comprehension, memory, mathematics,
writing, and etc. However, the previous analyses did not
show the relationship between targeted behaviors and
treatment.
Additionally, in Korea, a large number of studies have
been conducted, regarding learning strategy programs and
their overall effectiveness. What seems to be lacking,
however, is the comprehensive and systematic summary of
the research findings. When we want to help teachers and
students to be more effective in teaching and learning, it is
not enough just to suggest a wide array of learning strategies
and their overall effects. We want to know what strategies
can be more effective when used upon whom and how to use
these strategies.
Based on a teaching and learning model by McKeachie
et al. (1991), learning behavior is directly influenced by
learner’s cognition and motivation. This indicates when we
apply learning strategies for learners we should consider
learners’ intrapersonal conditions and characteristics. By
examining Piaget’s cognitive development theory, we learn
what to expect in terms of learners’ thinking across different
Meta-analysis on Cognitive Learning StrategiesG
411
grade levels (Kim, 1998). This notion implies that not all
strategies can be used by all learners.
However, these theoretical ideas have not been verified
empirically in the field of strategy instruction, which need to
be done for educational practice. Many previous studies in
Korea have mainly offered immediate effects of the
cognitive learning strategies program in accordance with the
variables including academic achievement, cognitive ability,
efficacy of using learning strategies, and general affective
domains (Kim et al., 2002). A great deal of time is assigned
to subject specific learning in Korea. To help students learn
strategies effectively in time-bound situations, we clarify the
effect sizes of subcategories of learning strategies to apply
efficiently in practice. By integrating and comparing the
findings of related studies, researchers can capture general
patterns among different studies on similar topic, and
identify potentially robust relationships between learners and
appropriate learning strategies.
The main purpose of the present study was to provide a
comprehensive quantitative synthesis of cognitive learning
strategies studies that focused on intervention to improve
students' academic performance. More specifically, the topic
of the study was the general and detailed effectiveness of
cognitive learning strategies, which were provided in the
researches conducted in Korea from 1990 to 2006. Thus, the
research questions of this study were as follows: (a) Are
cognitive learning strategies generally effective? (b) What
type of cognitive learning strategy is most effective? (c) Are
effect sizes of different types of cognitive learning strategies
different by the applied domains, grade levels, and
achievement levels?
Method
Data Collection
Computerized literature searches of two extensive
databases (the National Assembly Library and the National
Library of Korea) were carried out to find relevant articles in
the peer-reviewed journals from 1990 to 2006. The computer
searches were conducted using combinations of the
following descriptors: learning strategy, meta-cognitive
strategy, cognitive strategy, and strategy education. From
this initial pool of identified studies, the following selection
criteria were applied.
First, the identified studies should include learning
strategies and outcome measures. Second, the identified
studies were limited to only those studies that compare
learning strategy treatment group(s) with control group(s).
Third, effect sizes should be obtainable to meet the
following criteria: the study must report (a) means and
standard deviation of each group, or (b) test statistics, such
as z-value, t-value, or F-value. Using the search and
screening procedures, 50 studies were identified that met the
criteria to be included in the meta-analysis.
Coding
A coding form was developed that included the study
information (e.g., authors, published year, a title), subject
characteristics (e.g., demographic data including grade level,
academic achievement, gender, sample size), intervention
dimensions (e.g., the categories of learning strategies,
number of sessions), the categories of applied domains, and
calculated effect sizes.
In most cases, encoding the studies was obvious.
However, coding the subtypes of learning strategies and the
categories of applied domains was not a simple matter.
Classification of cognitive leaning strategies was conducted
based on Weinstein and Mayer (1986): ‘elaborate strategy’,
‘organized strategy’, ‘meta-cognitive strategy’, ‘affective
strategy’, and ‘combined strategy’. The elaborative strategy
involved the strategy to integrate prior knowledge with
current information. The organized strategy is also related to
the mnemonic skills to categorize academic contents and
items or make them hierarchical array. The affective strategy
concerned the students’ strategies to facilitate their
motivation or to relieve the tension to overcome test anxiety.
The meta-cognitive strategy involved the strategy related to
planning, regulating, monitoring, and modifying cognitive
processes. If the intervention in the target article was
composed of more than two types of learning strategies, the
article was classified as the combined strategy.
Categories of applied domains were identified based on
the dependent variables of the target article: academic
achievement, cognitive ability, efficacy of using learning
strategies, and general affective domain. As for the academic
achievement level, in the articles we used in the present
study, underachievement student indicates whose academic
Dongil Kim, Boong-nyun Kim, Kijyung Lee, Joong-kyu Park, Sungdoo Hong, Hyoungsoo Kim
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412
achievement was far lower than his or her potential ability,
that is, LD (Learning Disability). The rest of them were
classified average achievement students.
Two coders coded all of the studies independently. Inter-
coder consistency was examined in order to indicate the
reliability of the coding procedures by calculating the inter-
rater reliability using Cohen’s Kappa, which was .79.
Calculation of Effect Size
The general procedures to obtain effect sizes were (a)
calculating the effect size(s) within a study and aggregating
across studies, (b) testing homogeneity of the aggregating
effect size, and (c) examining the confidence interval to
verify whether overall effect size includes zero.
The effect size index used in this meta-analysis was
Cohen's d (Cooper & Hedges, 1994), calculated as the mean
of the treatment group posttest score minus the mean of the
comparison group posttest score divided by the pooled
standard deviation; that is,
(1)
where MA and MB were the means for the variables for
treatments A and control B, respectively, and s was the
pooled SD. The pooled standard deviation was calculated as
indicated in Cooper and Hedges (1994). Effect sizes were
calculated for each treatment group and associated
dependent variables. Effect size g is the effect size from a
comparison in a study. Unbiased estimates of the population
effect size d were calculated by correcting (approximately)
for the bias in g(Hedges & Olkin, 1985):
(2)
where N= nA+nB, the sum of the number of
participants in Treatment A and in non-treatment B. The
variance of d was estimated by
(3)
When two or more effect sizes were produced in a
single article, the effect sizes were not independent. In this
case the Equations (4) and (5) were used to aggregate the
effect sizes.
(4)
with an estimated variance of
(5)
Table 1
Coding Categories
Categories Subcategories
Study Information author(s), published year, title
Grade level elementary school(6yr.), middle school(3yr.), high school(3yr.), college(2-4yr.)
Academic achievement level average achievement student, underachievement student (learning disabilities)
Gender male, female
Sample
Characteristics
Sample size sample size of treatment and non-treatment group
Subtypes of Learning
Strategies
elaborate strategy, organized strategy, meta-cognitive strategy, affective
strategy, and combined strategy
Intervention
Dimensions Number of Sessions under 5 sessions, 6-10 sessions, 11-15 sessions, 16-20 sessions, 21-25 sessions,
over 26 sessions
Dependent
Measures
Categories of Applied
Domains
academic achievement, cognitive ability, efficacy of using learning strategies,
and general affective domain
Meta-analysis on Cognitive Learning StrategiesG
413
The Equations above are the methods used to form an
aggregated effect sizes for several dependent measures used
in the target articles analyzed (Hedges & Olkin, 1985, pp.
212-213). The estimates produced by Equations (4) and (5)
were used in all of the subsequent analyses.
To determine the estimated aggregated effect size, we
used
(6)
where dc-agg is the aggregate of the set of values of the
effect sizes, weighted by the inverse of variance; dci is the
estimated effect size for comparison I; and k is the number of
effects aggregated (Hedges & Olkin, 1985, p. 111). The
estimate of the variance of this aggregate is given by
(7)
The Chi-square test (Q-test) was used to test for
homogeneity (Hedges & Olkin, 1985). The effect sizes could
be discussed in much the same way as a Z-score. An effect
size of +1.00 indicates that the performance of the
experimental group exceed the control group’s performance
on the dependent measure by one standard deviation. A
negative effect size indicates the superior performance of the
control. For the purpose of interpretation, Cohen’s (1988)
distinctions on the magnitude of the effect sizes were
used .20 in absolute value is a small size, .50 is of moderate
size, and .80 is a large effect size. We also offered standing
percentiles (U3) to interpret the effect size more
meaningfully. Additionally, effect size can be assessed from
its 95% confidence interval (CI). If the confidence interval
doesn’t include zero, then the positive mean effect is
significantly different from zero (p
G
< .05). The statistical
significance of ES was determined by examining the 95% CI.
Results
Description of the Identified Studies
Our literature search identified 50 different articles that
met the inclusion criteria. We computed 97 different effect
sizes from these 50 target articles. Among 50 articles that
reported the effects of learning strategies, one study
contained the primary level (Grade 1 through Grade 3) of
elementary students, twenty four studies involved the
intermediate level (Grade 4 through Grade 6), eighteen
studies were for middle school students, five studies
involved high school, and two studies were focused on
college students. Thus, the majority of the articles were
drawn from intermediate level of elementary schools and
middle schools. As for the achievement level of the subjects
in the studies, the majority (40, 79.6%) of the studies
involved the average achievement students, the rest of them
(10, 20.4%) involved the underachievement students
(Learning Disabilities).
The estimated aggregate effect size was .96, and, as a
result of Q-test analysis, it was found to be not homogenous
(Q = 55.19, p
G
< .05). Thus, in each subcategory of learners'
characteristics and applied domains we calculated effect
sizes and conducted the tests of homogeneity.
Effect Sizes of Subtypes of Cognitive Learning Strategies
The effect sizes of subtypes of cognitive learning
strategies were provided in Table 2. According to the second
column of Table 2, the variation of the number of effect size
of each learning strategy was wide. There were meta-
cognitive strategy (21, 42.0%), elaborate strategy (10,
20.0%), and organized strategy (8, 16.3%).
The effect sizes were significant and homogenous.
Organized strategy produced the moderate effect sizes (.45).
Generally the effect sizes of subcategories of cognitive
learning strategies were regarded as large enough (.93-.1.13).
Effect Sizes by Applied Domains of Learning Strategies
In the present study, the applied domains of learning
strategies (dependent variables in the target articles) were
classified into four categories; (a) academic achievement, (b)
cognitive ability, (c) efficacy of using learning strategies,
and (d) general affective domain. The number of studies of
the applied domains was reported in Table 3. The most
frequent ‘applied domain’ was cognitive ability (36.0%),
followed by academic achievement and general affective
domain (16.0%).
Dongil Kim, Boong-nyun Kim, Kijyung Lee, Joong-kyu Park, Sungdoo Hong, Hyoungsoo Kim
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414
In Table 4, since any confidence interval (CI) of the
mean effect sizes of all applied domains did not contain zero,
a null hypothesis was rejected. The cognitive learning
strategies were very effective in any category of applied
domains. The effect sizes were identified as large enough
(.83-1.69).
Effect Sizes by Student Grade Levels
Mean effect sizes of cognitive learning strategies by
student grade levels. The mean effect sizes of learning
strategies were analyzed by grade levels. Table 5 showed the
mean effect size of each cognitive learning strategy. The
effect sizes of all the grade levels were generally large and
were not homogenous. The effect of cognitive learning
strategies was very large to students in all grades (.85-1.34),
except for middle school students. The effect size of middle
school had a moderate effect size (.70). In Table 5, while all
subtypes of cognitive learning strategies except organized
strategy for the intermediate level (Grade 4 through Grade 6)
of elementary school students produced relatively large
effect sizes. Combined strategy for middle school students
Table 2
Effect Sizes of Subtypes of Cognitive Learning Strategies
CI (95%)
Number of
studies
Number of
ES Mean ES SD of Mean
Effect Size U3(%) Lower Upper
Elaborate strategy 10 12 .93 .84 82.38 .40 1.46
Organized strategy 8 14 .45 .30 67.36 .28 .62
Combined strategy 7 20 1.13 .82 87.08 .74 1.51
Meta-cognitive strategy 21 42 1.04 .95 85.08 .74 1.34
Affective strategy 4 9 1.10 1.64 86.43 .17 2.36
Total 50 97 .96 .10 83.15 .77 1.16
Table 3
Number of Studies by Applied Domains
Applied domains 1 2 3 4 1,2 1,4 2,3 2,4 3,4 1,2,4 1,3,4 2,3,4 Total
Number of Studies 5 18 1 2 1 8 4 3 1 1 3 3 50
Percentage (%) 10.0 36.0 2.0 4.0 2.0 16.0 8.0 6.0 2.0 2.0 6.0 6.0 100
Note. 1. Academic achievement 2. Cognitive ability 3. Efficacy of using learning strategies 4. General affective domain
Tabel 4
Effect Sizes of the Applied Domains
CI
Applied domains Number of
Effect Size
Mean Effect
Size
SD of Mean
Effect Size U3(%) Lower Upper
Academic achievement 21 .96 1.18 83.15 .42 1.50
Efficacy of using learning strategies 12 1.69 1.22 95.45 .91 2.46
Cognitive ability 40 .83 .81 79.67 .57 1.09
General affective domain 24 .83 .12 79.67 .58 1.07
Total 97 .96 .10 83.15 .77 1.16
Meta-analysis on Cognitive Learning StrategiesG
415
showed large effect sizes (1.06) compared to the other
strategies which were moderate in their effect sizes. As for
high school and college students, meta-cognitive strategy
and combined strategy yielded large effect sizes (1.06, 1.02).
Mean effect sizes by applied domains and grade levels.
Table 6 showed the effect sizes of applied domains by grade
levels. The effect sizes of applied domains by grade levels
were not homogenous. Cognitive learning strategies were
comprehensively used in four applied domains across the
grade levels and also yielded generally large effect sizes. For
the primary grade level of elementary school students, the
learning strategies applied to general affective domain was
very effective (1.19), the learning strategies applied to
academic achievement produced the moderate effect sizes
(.51). However due to the small sample size, further studies
were in order. For the intermediate level of elementary
school students, the learning strategies were very effective in
all domains. Especially in terms of learning strategies when
applied to efficacy of using learning strategies and academic
achievement, yielded the very large effect sizes (1.97, 1.55).
For middle school students, the learning strategies applied to
efficacy of using learning strategies, produced large effect
sizes (1.24), and the learning strategies applied to the other
domains produced moderate effect sizes. For high school
students, the learning strategies applied to the efficacy of
Table 5
Mean Effect Sizes of Learning Strategies by Grade Levels
CI(95%)
Grade Level Cognitive Learning
Strategy
Number of
Effect Size
Mean
Effect Size
SD of Mean
Effect Size U3(%) Lower Upper
Primary grade level of
elementary school Meta-cognitive strategy 4 .85 .27 80.23 .20 1.69
Elaborate Strategy 5 1.19 .45 88.30 .05 2.43
Organized Strategy 6 .53 .17 70.19 .08 .98
Meta-cognitive strategy 17 1.18 .22 88.10 .71 1.66
Affective strategy 3 1.82 .78 96.56 .29 3.35
Intermediate grade
level of
elementary school
Combined strategy 5 1.37 .68 75.17 .52 3.26
Sub Total 36 1.15 .20 87.49 .77 1.16
Elaborate Strategy 7 .74 .27 77.04 .07 1.41
Organized Strategy 7 .38 .06 64.80 .23 .53
Meta-cognitive strategy 13 .58 .19 71.90 .17 .99
Affective strategy 4 .74 .14 77.04 .29 1.19
Middle school
Combined strategy 9 1.06 .20 85.54 .60 1.53
Sub Total 40 .70 .10 75.80 .51 .89
Organized Strategy 1 .49 .00 68.79 * *
Meta-cognitive strategy 8 1.60 .47 94.52 .50 2.71
High school
Affective strategy 2 .72 .05 76.42 * *
Sub Total 11 1.34 .36 90.99 .54 2.14
College Combined strategy 6 1.02 .11 84.61 .75 1.29
Total 97 .96 .10 83.15 .77 1.16
Note. * Due to the limited sample size (n< 3), the CI was not calculated.
Dongil Kim, Boong-nyun Kim, Kijyung Lee, Joong-kyu Park, Sungdoo Hong, Hyoungsoo Kim
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416
using learning strategies, general affective domain, and
academic achievement produced large effect sizes. Moreover,
the learning strategies applied to cognitive ability were
moderate (.45). For college students, the learning strategies
were generally very effective. Nevertheless, we should be
cautious in interpreting the result due to the limited sample
size of the studies.
Effect Sizes by Achievement Level
Mean effect sizes of cognitive learning strategies by
achievement level. Table 7 provided the effect size of each
cognitive learning strategy for average achievement students,
as well as for underachieving students (LD). The effect sizes
of achievement level were homogenous. Cognitive learning
strategies were more frequently applied for average
achievement students. The effect sizes of cognitive learning
strategies for both groups yielded generally large effect sizes.
Mean effect sizes by applied domains and achievement
level. Table 8 indicated the effect sizes by applied domains
and achievement level. The effect sizes of achievement level
were not homogenous. Cognitive learning strategies were
widely used in four applied domains across the academic
level and also yielded generally large effect sizes.
G
Summary and Discussion
The purpose of the present study was to synthesize the
Table 6
Mean Effect Sizes by Applied Domains and Grade Levels
CI (95%)
Grade Level Applied Domains Number of
Effect Size
Mean
Effect Size
SD of Mean
Effect Size U3(%) Lower Upper
Academic achievement 2 .51 .35 69.50 * *
Primary grade level
of elementary school General affective domain 2 1.19 .25 88.30 * *
Academic achievement 6 1.55 .84 93.94 .60 3.70
Cognitive ability 20 1.02 .22 84.61 .56 1.49
Efficacy of using learning strategies 3 1.97 .60 97.56 .80 3.15
Intermediate grade
level of elementary
school General affective domain 6 .80 .11 78.81 .53 1.07
Academic achievement 10 .75 .20 77.34 .30 1.20
Cognitive ability 14 .63 .14 73.57 .32 .93
Efficacy of using learning strategies 5 1.24 .37 89.25 .21 2.27
Middle school
General affective domain 11 .49 .14 68.79 .18 .80
Academic achievement 2 .83 .06 79.67 * *
Cognitive ability 4 .45 .10 67.36 .14 .76
Efficacy of using learning strategies 2 3.18 .97 99.93 * *
High school
General affective domain 3 1.65 .50 95.05 .51 3.81
Academic achievement 1 .74 .00 77.04 * *
Cognitive ability 1 1.36 .00 91.31 * *
Efficacy of using learning strategies 2 .93 .18 82.38 * *
College
General affective domain 2 1.13 .14 87.08 * *
Total 97 1.05 .22 85.31 .62 1.48
Note. * Due to the limited sample size (n< 3), the CI was not calculated.
Meta-analysis on Cognitive Learning StrategiesG
417
results of the cognitive learning strategies intervention
studies conducted in Korea from 1990 to 2006. By the use of
pre-established and systematic criteria, 50 articles were
selected and analyzed. Effect size was calculated using 'the
Cohen's d' (Cooper & Hedges, 1994).
The results of the study indicated that overall cognitive
learning strategies (97 ESs) yielded a large effect size (.96),
which implied that the mean of the treatment group was
located on the .82 percentile in the normal curve distribution
of control group. However, the aggregated effect sizes were
not homogenous. Thus, we were advised to calculate effect
sizes and do the test of homogeneity in each subcategory of
cognitive strategies. Except for grade levels, the effect sizes
turned out to be homogenous in each subcategory, meaning
that the differences of effect sizes of cognitive learning
strategies were not significant.
Table 7
Mean Effect Sizes of Cognitive Learning Strategies by Achievement Level
CI(95%)
Achievement
level
Cognitive learning
strategies
Number of
Effect Size
Mean Effect
Size
SD of Mean
Effect Size U3(%) Lower Upper
Elaborate strategy 9 .79 .30 78.52 .09 1.48
Organized strategy 14 .45 .08 67.36 .28 .62
Meta-cognitive strategy 32 .88 .15 81.06 .57 1.18
Affective strategy 7 1.26 .70 89.62 .45 2.98
Average
Achievement
Student
Combined strategy 12 .88 .12 81.06 .62 1.15
Sub Total 74 .82 .10 79.39 .62 1.02
Elaborate strategy 3 1.36 .29 91.31 .01 2.62
Meta-cognitive strategy 10 1.56 .36 94.06 .74 2.37
Affective strategy 2 .51 .06 69.50 .22 1.24
Under-achievement
Student
Combined strategy 8 1.50 .41 93.32 .54 2.45
Sub Total 23 1.42 .21 92.22 1.01 1.83
Table 8
Mean Effect Sizes of Applied Domains by Achievement Level
CI(95%)
Achievement level Applied domains Number of
Effect Size
Mean Effect
Size
SD of Mean
Effect Size U3(%) Lower Upper
Academic achievement 17 .95 .32 82.89 .28 1.62
Cognitive ability 34 .66 .11 74.54 .44 .87
Efficacy of using learning strategies 7 1.57 .42 94.18 .53 2.61
Average
Achievement
Student General affective domain 16 .70 .12 75.80 .45 .95
Academic achievement 4 1.01 .26 84.38 .20 1.82
Cognitive ability 6 1.77 .48 96.16 .54 3.01
Efficacy of using learning strategies 5 1.86 .65 96.86 .05 3.67
Under-achievement
Student
General affective domain 8 1.08 .26 85.99 .47 1.69
Dongil Kim, Boong-nyun Kim, Kijyung Lee, Joong-kyu Park, Sungdoo Hong, Hyoungsoo Kim
G
418
The findings revealed that cognitive strategies had a
significantly large effect size (.82-1.69). Moreover, cognitive
learning strategies were very effective for average achieving
and Learning Disabilities together (.82-1.42). The effect of
cognitive learning strategies was very large for students in
all grades (1.02-1.34), except for middle school students.
The effect size for middle school students had a moderate
effect size (ESsm = .70).
The present study focused on the cognitive learning
strategy, which turned out to be similar to the previous study
in Korea (Kim, Shin, & Hwang, 2002). The previous study
in strategy instruction dealt with the whole package of
learning strategies including cognitive learning strategy,
which was designed to enhance motivation, self-efficacy,
and to improve strategies for test skills and self-management.
A plausible conclusion about the effects of the various
types of cognitive learning strategies was that, in general,
cognitive learning strategies were quite effective, even
though the effective sizes of cognitive learning strategies for
middle school students were still moderate. Additionally, the
results indicated that all of the subtypes of cognitive learning
strategies were effective interventions in the applied
domains for both average achieving students and those with
Learning Disabilities.
The present study indicated that cognitive learning
strategies would be effective for all grade levels. However,
the effect sizes among grade levels were not homogenous,
which indicates the effect sizes among grade level could be
different. From this finding, we need to emphasize our
understanding of learner’s cognitive developmental stages.
Moreover, elaborate strategy as a cognitive skill was
regarded to be voluntarily used after middle school ages.
Considering the complexity of connecting two or more items
of information, a learner is old enough to have the ability to
enhance and integrate the meaning of given information and
also have background knowledge (Pressley, 1986; Song,
2000). However, the results of this study suggested that
learners in the intermediate grade level of elementary school
could adopt learning strategies efficiently as well as
voluntarily.
Further studies are in order to analyze the reasons why
the effect sizes for middle school students were smaller than
the other grade levels. This finding suggested that early
interventions of learning strategies in the elementary level
might be very helpful later on. Given the small number of
subjects in the lower elementary school and college students,
one must be cautious in drawing any broad conclusions. To
sum up, the results of the study indicated the following
implications: First, this study confirms that most of the
cognitive learning strategies are effective across a range of
diverse learners and can be applied to different subject
matter. Second, early interventions using learning strategies
could be very effective and it is a recommended practice for
both teachers and students.
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Received June 5, 2007
Revision received February 22, 2008
Accepted October 30, 2008
Dongil Kim, Boong-nyun Kim, Kijyung Lee, Joong-kyu Park, Sungdoo Hong, Hyoungsoo Kim
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This article is the second of a twopart series designed to review the critical features of facilitating generalization and adaptation of learning strategies. In Part 1, a model of generalization was presented along with research supportive of the model and identification of research needs. Essentially, the model views instruction for generalization not as something that comes at the end of an instructional sequence, but rather as consisting of four levels of generalization that transverse instruction—antecedent, concurrent, subsequent, and independent. The purpose of this article is to consolidate a number of studies that describe a unified set of specific instructional techniques that can be used while addressing generalization and to present them as part of an overall instructional approach for learning strategies. Within each level, specific procedures mediated by the special (or remedial) education teacher, regular content teacher, peer, and/or student are illustrated. Each category is followed by a synthesis of related teaching practices. The procedures identified here should not be considered definitive because demonstration of efficacy awaits additional validation; however, they do serve as a basis for planning instruction consistent with what has been learned about generalization to date.
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Drawing upon theory-driven vocabulary instruction and the vocabulary-reading comprehension connection, this study compared the effectiveness of three interactive vocabulary strategies derived from the knowledge hypothesis with definition instruction derived from the access and instrumental hypotheses. Subjects were 61 learning disabled junior-high students. Using content-area texts, students participated in one of three interactive strategies — semantic mapping (SM), semantic feature analysis (SFA), and semantic / syntactic feature analysis (SSFA) — or in definition instruction (DI). Learning was measured both at short and long term by vocabulary and comprehension multiple-choice items and written recalls. Results from the multiple-choice items suggested that students participating in the interactive strategies demonstrated greater comprehension and vocabulary learning than students receiving definition instruction. Results of the written recalls indicated qualitatively and quantitatively greater recalls at long term for students in the SFA and SSFA conditions compared with the DI condition. Implications for research and practice are discussed.
Article
Thirty-six 10- to 12-year-old learning disabled (LD) children with reading problems and 36 regular class children matched with the LD children on reading age were assigned to four training conditions, designated as read-reread, self-questioning and underlining, self-questioning only, and underlining only techniques. Training was conducted in small groups over a sequence of four half-hour sessions. Subjects were trained to utilize the prescribed techniques while reading comprehension passages. Results indicated that the LD children in all three experimental groups (SU, S, U) achieved significantly higher scores on the comprehension tests than those in the control (R) condition, whereas data on the regular class students in all four conditions revealed nonsignificant differences. The findings demonstrated the benefit of training LD students to use metacognitive activities in reading comprehension.
Article
Educators have long been concerned with generalization of cognitive interventions. Typically, educators view generalization as a stage of instruction that follows acquisition of a new skill. In an effort to shed light on the problem of generalization with regard to learning strategies, this paper presents generalization as a concept that should be addressed prior to, during, and subsequent to instruction in use of a strategy. A model for generalization is described that emphasizes elements of remedial teacher-, regular teacher-, peer-, and student-mediated techniques for facilitating generalization during all phases of instruction. Studies that illustrate components of the model are reviewed, and future research needs in this area are identified. This article is the first of a two-part series.
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This article summarizes a comprehensive synthesis of experimental intervention studies that have included students with learning disabilities. Effect sizes for 180 intervention studies were analyzed across instructional domains, sample characteristics, intervention parameters, methodological procedures, and article characteristics. The overall mean effect size of instructional intervention was positive and of high magnitude (M = 0.79). Effect sizes were more positive for a combined model that included components of direct and strategy instruction than for competing models. Interventions that included instructional components related to controlling task difficulty, small interactive groups, and directed responses and questioning of students were significant predictors of effect size, and interventions that varied from control conditions in terms of setting, teacher, and number of instructional steps yielded larger effect sizes than studies that failed to control for such variations. The results are supportive of the pervasive influence of cognitive strategy and direct instruction models for remediating the academic difficulties for children with learning disabilities.