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Project-based learning: A review of the literature

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Abstract

Project-based learning (PBL) is an active student-centred form of instruction which is characterised by students’ autonomy, constructive investigations, goal-setting, collaboration, communication and reflection within real-world practices. It has been explored in various contexts and in different phases of schooling, from primary to higher education. The majority of the reviewed studies were based on a quasi-experimental pretest–posttest design with some baseline equivalence established but no random allocation of participants to control and experimental groups, and as a result, a causal link between PBL instruction and positive student outcomes cannot be established with certainty. Modern digital technology, group processes of high quality, teachers’ ability to effectively scaffold students’ learning and provide guidance and support, the balance between didactic instruction with in-depth inquiry methods and well-aligned assessment have been identified in the literature as facilitating factors in the implementation of PBL. The article concludes with six key recommendations considered to be essential for the successful adoption of a PBL approach in the mainstream school setting.
Project-based learning: a review of the literature
Defining characteristics of project-based learning
Project-based learning is a student-centred form of instruction which is based on
three constructivist principles: learning is context-specific, learners are involved
actively in the learning process and they achieve their goals through social
interactions and the sharing of knowledge and understanding (Cocco, 2006). It is
considered to be a particular type of inquiry-based learning where the context of
learning is provided through authentic questions and problems within real-world
practices (Al-Balushi & Al-Aamri, 2014) that lead to meaningful learning experiences
(Wurdinger, Haar, Hugg & Bezon, 2007). Blumenfeld, Fishman, Krajcik, Marx and
Soloway (2000), for example, described the process of project-based science as
follows:
‘The presumption is that students need opportunities to construct knowledge by
solving real problems through asking and refining questions, designing and
conducting investigations, gathering, analysing, and interpreting information
and data, drawing conclusions, and reporting findings’ (p.150).
Project-based learning as a form of instruction has clear connections with other
pedagogical approaches, such as problem-based learning among others (Helle,
Tynjälä & Olkinuora, 2006). The focus in both is for participants to achieve a shared
goal through collaboration. In their engagement with a project, students can
encounter problems which need to be addressed in order to construct and present
the end product in response to the driving question. The main difference between
the two is that, whereas students in problem-based learning are primarily focused on
the process of learning, project-based learning needs to culminate in an end product
(see also Blumenfeld et al., 1991). Project-based learning has also been compared
with other pedagogical practices such as experiential or collaborative learning. As
Helle et al. (2006) argue, project work is a collaborative form of learning as all
participants need to contribute to the shared outcome and has elements of
experiential learning with active reflection and conscious engagement rather than
passive experiences being essential. This study focuses on a review of the relevant
literature on project-based learning as defined above looking at relevant studies
internationally that seek to evaluate benefits to learning. It concludes with six key
recommendations considered to be essential for the successful adoption of a project-
based learning approach in the mainstream school setting.
It has been argued that the freedom and challenge that students experience as a
result of solving the problems that arise in designing and building their projects result
in high levels of student engagement (Wurdinger et al, 2007) due to the cognitive
challenge as well as the strong affective, ethical and aesthetic dimensions that form
part of a well-designed project (Wrigley, 2007). Thomas (2000) identified five
essential characteristics of projects: 1. Centrality, 2. Driving question, 3. Constructive
investigations, 4. Autonomy and 5. Realism, with the importance of student
collaboration, reflection, redrafting, and presentations emphasised in other
publications (Kwon, Warderip & Gomez, 2014; Patton, 2012). The uniqueness of
project-based learning is the construction of an end product, a ‘concrete artefact’
(Helle et al., 2006) which represents students’ new understandings, knowledge and
attitudes regarding the issue under investigation often presented using videos,
photographs, sketches, reports, models and other collected artefacts (Holubova,
2008).
It is argued that it can help foster self-regulated learning and can promote pupils’
conceptual knowledge within a systematic process of documenting and reflecting on
learning (Barak, 2012). Students learn to be self-reliant through goal-setting,
planning and organisation, they develop collaboration skills through social learning
and become intrinsically motivated by being encouraged to exercise an element of
choice while learning at their own level (Bell, 2010). Project-based learning has
been explored in various contexts and in different phases of schooling ranging from
the early stages of education through primary and secondary school to higher
education.
Overview of the evidence for the effectiveness of project-based learning
Most of the reviewed studies did not involve random allocation of participants to
control and experimental groups and, as a result, a causal link between project-
based learning instruction and positive student outcomes cannot be established with
certainty. The majority of these studies were based on a quasi-experimental pretest-
posttest design with some baseline equivalence established for the outcomes
measured at the classroom level. Some studies of weaker quality were based on
observations of students’ behaviour, attitudes and accomplishments in a project-
based learning environment without the presence of a comparator group (for
example, Barak & Asad, 2012; ChanLin, 2008; Cuevas, Lee, Hart & Deaktor, 2005;
Morales, Bang & Andre, 2013). Other studies have used state standardised test
averages against which to compare the performance of 7th/8th grade students (Geier
et al., 2008) and 12th grade students (Schneider, Krajcik, Marx & Soloway, 2002).
Sweller, Kirschner and Clark (2007) have emphasised the importance of randomised
controlled experimental studies of different instructional procedures to provide
stronger and more reliable evidence on the effectiveness of project-based learning.
Pre-school and primary school
Implementation of a project-based concept mapping developmental programme to
facilitate children’s experiential reasoning and comprehension of relations (Habok,
2015) reported positive results for the experimental group that attended one of the
two kindergartens in Hungary. In particular, even though the experimental group
started with a disadvantage in achievement, there was a significant increase in this
group’s development compared to the control group. Habok concluded that the use
of concept maps in school practice holds promise as a visual expression tool in
promoting understanding of connections and causalities. Another study with pre-
school science teachers in Sweden (Ljung-Djärf, Magnusson & Peterson, 2014)
argued that a learning study project model (a kind of action research that combines
variation theory with the concept of lesson study) has the potential to promote pre-
school science.
In their quasi-experimental study on the effectiveness of project-based learning in
primary school in Greece, Kaldi, Filippatou and Govaris (2011) argued that primary
age pupils can develop content knowledge and group work skills in addition to
motivation and positive attitudes towards peers from a different ethnic background
through project based-learning instruction. Similarly, Karaçalli and Korur (2014)
conducted a quasi-experimental study in Turkey with fourth-grade science students
(equivalent to Year 5 in the UK) and found a statistically significant effect in terms of
academic achievement and retention of knowledge for the project-based learning
students. A US study that explored the effectiveness of a project-based approach in
2nd grade (equivalent to Year 1 in the UK) social studies and content area literacy
(Halvorsen, Duke, Brugar, Berka & Brown, 2012) reported positive outcomes for low-
SES students and claimed that the project-based learning approach has the potential
to help narrow the gap between low and high-SES students in social studies and
literacy for 2nd grade students. The study employed a ‘design or formative
experiment approach’ (p.10) where six teachers and a subset of their students
participated in the study. Two teachers were from high-SES schools and four
teachers from low-SES schools. The teachers in the low-SES schools implemented
project-based units in their teaching which were developed by the researchers. In
addition to student assessments, data were also collected through classroom
observations and teacher interviews. The study had a number of limitations, such as
a small sample size (N=10-12 from each class with 43 children in low-SES and 20
children in high-SES classrooms), lack of a control group and researcher designed
assessment measures that may be less reliable and valid in comparison to other
published standardised measures.
Secondary school
Al-Balushi and Al-Aamri (2014) conducted a quasi-experimental study with 62 11th
grade female students (equivalent to Year 12 in the UK) in Oman that explored the
effect of environmental science projects on students’ environmental knowledge and
attitudes towards science. Two classes were randomly assigned into an
experimental group and a control group. The findings were positive with the
experimental group significantly outperforming the control group in the
Environmental Knowledge Test and the Science Attitudes Survey. The authors
acknowledged, however, that a novelty effect could not be ruled out as students’
enthusiasm in the experimental group in using new technology to design their
products could have led to the more positive results in the post-tests.
In history learning, Hernández-Ramos and De La Paz (2009) had eighth grade
students in the US (equivalent to Year 9 in the UK) learn to create multimedia mini-
documentaries in a six-week history unit. Compared to students who received
traditional instruction, students that engaged in the project-based learning curriculum
demonstrated positive affective benefits and significant gains in content knowledge
as well as historical thinking skills. This was a quasi-experimental study using a
pretest-postttest design and there was no random allocation of students or teachers
to control and experimental conditions. Therefore, it cannot be inferred with certainty
that the knowledge gains are necessarily the result of technology-enhanced project-
based learning at the intervention school as other teaching and learning activities
could have contributed to the positive results.
Another quasi-experimental study carried out in the US (Hsu, Van Dyke, Chen &
Smith, 2015) explored seventh graders’ (equivalent to Year 8 in the UK) development
of argumentation skills and construction of science knowledge in a graph-oriented
computer-assisted project-based learning environment. A significant difference in
science knowledge, counterargument and rebuttal skills was found in favour of the
treatment condition. In another US study, Geier et al. (2008) reported that 7th and 8th
grade students that participated in project-based inquiry science units showed
increased science content understanding, better process skills and significantly
higher pass rates on the statewide test over the remainder of the district population.
Boaler (1998) conducted a longitudinal study of mathematics instruction comparing
an open, project-based environment to a traditional approach and it followed two
cohorts of students in two British secondary schools from Year 9 to Year 11. Even
though this study did not involve the random allocation of participants, it employed a
closely-matched control group in terms of socioeconomic status, prior mathematics
instruction and attainment. A variety of instruments were used to measure students’
skills, attitudes and attainment. The main finding was that the two groups developed
different forms of knowledge. The students learning mathematics in the project-
based environment developed conceptual understanding which often required
creative and deeper thinking in contrast to the procedural knowledge acquired by the
traditional instruction group which was mainly based on information recall. In
addition, more students at the project-based school succeeded in passing the
General Certificate of Secondary Education (GCSE) at the end of the three-year
study than those students receiving the traditional instruction.
Other studies have shown higher learner motivation in a project-based learning
environment with fourteen and fifteen year old girls in Israel showing increased
interest in learning scientific-technological subjects (Barak and Asad, 2012). Project-
based learning as related to STEM (science, technology, engineering and
mathematics) curriculum design for female senior high school students in Taiwan led
to gains in terms of enjoyment, engagement with the project and the ability to
combine theory and practice effectively (Lou, Liu, Shih & Tseng, 2011). This study
was an in-depth investigation of 84 students’ cognition, behavioural intentions and
attitudes in the project-based STEM environment and involved text analysis and
questionnaire survey as the main data collection tools.
he 10-11 year old students in ChanLin’s (2008) qualitative study in Taiwan developed
skills in synthesising and elaborating knowledge and in engaging in scientific
exploratory tasks with the use of technology. Project-based learning has also been
explored as a method of instruction with low-achieving students in Israel (Doppelt,
2003) and the US (Cuevas et al., 2005), and with second chance school students in
Greece (Koutrouba & Karageorgou, 2013) with positive outcomes. Doppelt (2003)
found that scientific-technological project-based learning helped improve low-
achieving students’ motivation and self-image by allowing students to succeed early
on in the process and led to more students achieving the college admittance
requirements. Doppelt’s study was a field research project that used qualitative and
quantitative tools (portfolio analysis, observations, interviews, matriculation
examination results and assessment of students’ projects) with a sample of 54 10th to
12th grade students (fifteen to eighteen years old).
Encouraging results were also reported with high school high achievers in Israel
where 60 students from three experimental classes in comprehensive high schools
exhibited a significant increase in formal technological knowledge and skills and
more positive attitudes towards technology in comparison to the students in the three
control classes which were drawn from technological high schools (Mioduser &
Betzer, 2007). However, the different type of schools involved suggests differences
in student take-up and characteristics, and indicate an unequal student comparison
which limits the strength of the findings.Some studies have shown mixed results.
For example, in their quasi-experimental study with 13 year old children (grade 8)
taking computer courses in Greece, Boubouka and Papanikolaou (2013) found no
significant effect of project-based learning on student achievement but a statistically
positive effect on self-perceived learning performances.
Project-based learning studies in higher education and in pre-service teacher training
A number of studies have explored the effectiveness of project-based learning in
higher education in different countries. Most of these studies have focussed on
engineering education. For example, Ruikar and Demian (2013) made links with
industry engagement through multimedia podcasting in the UK, Hassan and his
colleagues (2008) adopted an integrated, multicourse, project-based learning
methodology in electronic engineering in Spain and Fernandes et al. (2014) followed
the project-led education model developed by Powell and Weenk (2003), to engage
students in learning at a University in Portugal. In Australia, Stewart (2007)
investigated the link between self-directed learning readiness and project-based
learning outcomes in a postgraduate management course and found that self-
directed learning readiness, such as having high self-management skills, was a key
enabler for achievement learning outcomes from project-based learning. Another
study (Gibbes & Carson, 2014) investigated project-based language learning using
Activity Theory in a university language programme in Ireland. This study reported
mixed results in learning outcomes for the study participants because of
contradictions found in the activity system (e.g. inequitable divisions of labour,
perceived lack of time due to community obligations or opposition to the rules
governing the activity in the modules).
Some studies have applied the principles of project-based learning with pre-service
teachers and claimed that student-teachers can become better problem-solvers
(Mettas & Constantinou, 2008), can gain benefits from formative assessment (Frank
& Barzilai, 2002) and become more aware of the object of learning which can then
lead to enhanced learning among pre-school children (Ljung-Djärf, Magnusson &
Peterson, 2014).
The review of the literature indicated certain factors that can help facilitate the
adoption of project-based teaching instruction in the classroom. These are
summarised in the section that follows.
Facilitating factors in the implementation of project-based learning instruction
On the basis of their study and findings, Al-Balushi and Al-Aamri (2014) concluded
that project-based instruction is not more demanding than traditional instruction in
terms of resources and time and can be implemented with few resources, inside the
school building and within the time allocated for the study of particular topics.
Modern digital technology is a major enabler for students to comfortably engage with
the process of designing and developing their project as they can document the
whole process and easily share their creations in a digital format (Patton, 2012).
Effective use of technology as an integrated part of the pedagogical processes has
been found to help both weakly and strongly performing students construct
knowledge in the project-based learning environment (Erstad, 2002). However, Bell
(2010) points out that children need to be guided and supported in using technology
safely and effectively to gain the creativity affordances that technological involvement
can offer.
Furthermore, group processes of high quality (conceptualised as group members
showing positive interdependence, individual accountability, equal participation and
social skills) have been found to play a pivotal role to the success of collaboration in
project-based learning (Cheng, Lam & Chan, 2008). High quality group work
becomes even more important when challenges associated with social class
differences, gender and attainment hierarchies have been found to affect power
relations among some students in the project-based learning group leading to
unequal learning possibilities with some pupils enjoying more agency than others
(Crossouard, 2012). Crossouard argues that teachers need to be better supported,
both within initial teacher education and continuing professional development, to
develop more sensitivity towards the social and gendered hierarchies that can often
be implicit in pupils’ discourse, particularly in relation to peer assessment
interactions. Issues of social equity can thus become part of the pedagogic focus
and the language used in the classroom in order to explore social relations.
The successful implementation of project-based learning in the classroom lies on the
teacher’s ability to effectively scaffold students’ learning, motivate, support and guide
them along the way. Effective scaffolded instruction within high-quality experiences
will help reduce students’ ‘cognitive load’ (Hmelo-Silver, Duncan & Chinn, 2007), will
enable them to make small successful steps and ultimately achieve ‘cognitive growth
just beyond their reach’ (Bell, 2010, p.41). Leaving scope for learner control of the
learning process is crucial with teachers and students having to work together to
reflect upon the purpose of the project, set clear and realistic goals, and make
decisions regarding the pace, sequencing and content of learning (Helle et al.,
2006). In scaffolding students’ learning, teachers may need to give students insight
into the content of the desired response in project-based learning in order to allow
them to recognise and take up the learning opportunities afforded in the classroom
(Gresalfi, Barnes & Cross, 2012). Based on their case study findings in the US,
Grant and Branch (2005) concluded that the exploration of cross-disciplinary units
and team teaching should be emphasised so that students can understand how their
abilities can be used across domains and avoid the fragmentation of skills and
knowledge.
The level of support that teachers get from the school’s senior management (Erstad,
2002) and from other colleagues is of particular importance. Lam, Cheng and Choy
(2010) concluded that when teachers felt well supported by their schools in terms of
their competence and autonomy, they were more motivated to implement and persist
in using project-based learning.
The use of a two-phase project-based approach has been put forth in the literature
as an effective approach to first help the students become sufficiently competent by
developing the knowledge and skills needed to then be able to design and make
products independently in the second phase (see, for example, Drain, 2010; Good &
Jarvenin, 2007). Drain (2010) used the Cognitive Apprenticeship framework which,
on the basis of situated cognition theory, claims that learning is maximised when it
occurs in real life contexts and students engage with authentic problems. This was a
case study of a primary school class (Year 5) in New Zealand and their teacher
during a technology unit. The first part of the unit aimed to help pupils develop
knowledge of technological concepts and procedures through appropriate activities
while the second half enabled pupils to be creative and exercise initiative in
designing and creating their projects. The importance of balancing didactic
instruction with in-depth inquiry methods has also been emphasised by Grant and
Branch (2005). Student assessment needs to be aligned to the unique features of
the project-based learning process and outcomes with teachers identifying suitable
assessment moments where they can first generate ‘teachable moments’ (Lehman,
George, Buchanan & Rush, 2006) and then create formative scaffolds to guide and
support their students along the project process (Hmelo-Silver et al., 2007).
Assessment in project-based learning has been described as ‘authentic’ (Bell, 2010,
p.43) which, in addition to measuring a child’s performance via rubrics, it primarily
focuses on reflection, self and peer evaluation. Self-assessment skills can help
students learn to regulate their own learning and acquire ownership of the learning
process (Ertmer & Simons, 2005).
How teachers can support project-based learning in the classroom – what the evidence
shows
Mergendoller and Thomas (2005) interviewed twelve expert teachers in project-
based learning in the US to elicit the teachers’ strategies for implementing and
managing the project, and maximizing its success. These teachers were recognised
as experts within the national PBL community, they had trained other teachers and
had made presentations on project-based learning at various professional
conferences and workshops. Forty three questions formed part of the semi-
structured interview schedule and covered aspects of overall planning and project
planning, carrying out the project and the future of project work in the classroom.
The interview transcripts were coded into narrative segments that led to themes
about aspects of project implementation such as time management, getting started
and managing student groups. This analysis revealed a number of successful
techniques employed by expert teachers in project-based learning and were grouped
around seven overarching themes and 18 sub-themes. Each sub-theme comprised
a number of principles or guidelines which aim to provide practical advice to teachers
and are summarised below under each theme.
1. Time management – This theme relates to scheduling projects effectively by
coordinating project schedules with other teachers, for example, or use block
scheduling to increase flexibility, and be able to hold to timelines by building in
a 20% overrun when planning a project or learning when to enforce and when
to extend a time line.
2. Getting started This theme is about orienting students, i.e. getting them
think about the project well before they begin, giving them a rubric that clearly
explains what they are expected to search for and try to accomplish and
jointly agreeing on grading criteria before the start of the project. The ‘getting
started’ theme is also about encouraging thoughtful work early on in the
project in developing a research plan and a suitable research question while
facilitating a sense of mission.
3. Establishing a culture that stresses student self-management – Here,
responsibility is shifted from the teacher to students where students are
involved in project design, they make decisions for themselves and they are
encouraged to learn how to learn.
4. Managing student groups The emphasis is on establishing the appropriate
grouping pattern, promoting full participation and keeping track of each
group’s progress through discussion, monitoring and recording evidence of
progress.
5. Working with others outside the classroom, such as other teachers, parents
and people from the community in order to work out the feasibility and nature
of external partnerships.
6. Getting the most out of technological resources, such as judging the suitability
of using technology for the project, making efficient use of the internet by
being encouraged to make informed choices in exploring relevant web sites
and developing critical thinking skills.
7. Assessing students and evaluating projects – This final theme refers, firstly, to
the importance of grading students by using a variety of assessment methods,
including individual and group grades and giving emphasis to individual over
group performance and, secondly, to adequately debriefing projects by
demonstrating reflection strategies and collecting formative evaluation
information from students about the project and how it might be improved.
Starting from the premise that project-based teaching assumes significant changes
in classroom practices, Krajcik, Blumenfled, Mars and Soloway (1994) described
how teachers can learn to address the new challenges presented through the
dynamic interplay of three elements in middle school science teaching: teachers’
collaboration with consultants and university personnel to share and critique ideas,
plans and teaching activities; classroom enactment where teachers plan and carry
out new practices in the classroom in an attempt to construct and generate
understandings about what is possible in their classroom, modify their thinking and
adopt the most appropriate teaching strategies; teachers’ reflection on their teaching
via journals, case reports or videotapes of classroom implementation to develop the
knowledge that will help promote student learning.
Recommendations made on the basis of the evidence
On the basis of the literature review, the following six key recommendations can be
made which are considered to be essential for the successful adoption of a project-
based learning approach in the mainstream school setting.
1. Student support: students need to be effectively guided and supported;
emphasis should be given on effective time management and student self-
management including making safe and productive use of technological
resources.
2. Teacher support: regular support needs to be offered to teachers through
regular networking and professional development opportunities. The support
from the school senior management is crucial.
3. Effective group work: high quality group work will help ensure that students
share equal levels of agency and participation.
4. Balance between didactic instruction with independent inquiry method work
will ensure that students develop a certain level of knowledge and skills
before being comfortably engaged in independent work.
5. Assessment emphasis on reflection, self and peer evaluation: evidence of
progress needs to be regularly monitored and recorded.
6. An element of student choice and autonomy throughout the project-based
learning process will help students develop a sense of ownership and control
over their learning.
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... Apart from that, the learning activities designed in this module place a greater emphasis on project-based learning, in which students take an active participation through interesting projects. As project-based learning places a stress on students' active engagement in the learning process, it is best suggested to use real-world events to frame lessons through authentic questions and problems in the projects they will complete (Al-Balushi & Al-Aamri, 2014;Kokotsaki et al., 2016;Mardhiyah et al., 2021). Furthermore, the designed modules were then validated by a media expert and a material expert. ...
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