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Oncology Nursing Forum • Vol. 41, No. 5, September 2014 545
Methods & Meanings
Diane G. Cope, PhD, ARNP, BC, AOCNP® • Associate Editor
Nancy Carter, RN, PhD, Denise Bryant-Lukosius, RN, PhD, Alba DiCenso, RN, PhD, Jennifer Blythe, PhD,
and Alan J. Neville, MBChB, MEd, MRCP, FRCP(c)
The Use of Triangulation in Qualitative Research
ONF, 41(5), 545–547.
doi: 10.1188/14.ONF.545-547
Triangulation refers to the use of
multiple methods or data sources
in qualitative research to develop
a comprehensive understanding of phe-
nomena (Patton, 1999). Triangulation also
has been viewed as a qualitative research
strategy to test validity through the con-
vergence of information from different
sources. Denzin (1978) and Patton (1999)
identified four types of triangulation: (a)
method triangulation, (b) investigator
triangulation, (c) theory triangulation,
and (d) data source triangulation. The
current article will present the four types
of triangulation followed by a discussion
of the use of focus groups (FGs) and in-
depth individual (IDI) interviews as an
example of data source triangulation in
qualitative inquiry.
Types of Triangulation
The first type of triangulation is meth-
od triangulation. Method triangulation
involves the use of multiple methods of
data collection about the same phenom-
enon (Polit & Beck, 2012). This type of
triangulation, frequently used in quali-
tative studies, may include interviews,
observation, and field notes.
Investigator triangulation involves
the participation of two or more re-
searchers in the same study to provide
multiple observations and conclusions.
This type of triangulation can bring
both confirmation of findings and dif-
ferent perspectives, adding breadth to
the phenomenon of interest (Denzin,
1978).
Theory triangulation uses different
theories to analyze and interpret data.
With this type of triangulation, differ-
ent theories or hypotheses can assist
the researcher in supporting or refuting
findings.
Data source triangulation involves the
collection of data from different types of
people, including individuals, groups,
families, and communities, to gain mul-
tiple perspectives and validation of data.
Data Source Triangulation
Most qualitative researchers studying
human phenomena collect data through
interviews with individuals or groups;
their selection of the type of interview
depends on the purpose of the study
and the resources available. Fontana and
Frey (2000) described the IDI interview
as one of the most powerful tools for
gaining an understanding of human be-
ings and exploring topics in depth. IDI
interviews, ranging from the structured
and controlled to the unstructured and
fluid, can elicit rich information about
personal experiences and perspectives
(Russell, Gregory, Ploeg, DiCenso, &
Guyatt, 2005). IDI interviews allow for
spontaneity, flexibility, and responsive-
ness to individuals; however, conduct-
ing the interviews, transcribing the
discourse, and analyzing the text often
require considerable time and effort.
In contrast, FGs elicit data from a
group of participants who can hear
each other’s responses and provide ad-
ditional comments that they might not
have made individually. Researchers
who conduct FGs recognize that the
participant interaction, which stimulates
the identification and sharing of various
perspectives on the same topic, is central
to their success (Morgan, 1996). Several
authors have pointed out that research-
ers rarely evaluate or discuss this ap-
proach (Clayton, Butow, Arnold, & Tat-
tersall, 2005; Duggleby, 2005; Kitzinger,
1994; Lehoux, Poland, & Daudelin, 2006;
Sandelowski, 2000; Sandelowski & Bar-
roso, 2003; Webb & Kevern, 2001; Zorn,
Roper, Broadfoot, & Weaver, 2006). In
terms of time, compared to IDI inter-
views, FGs may initially be less demand-
ing to researchers; however, the time and
effort required to analyze the complex
data elicited from FGs might ultimately
negate any time savings (Mansell, Ben-
nett, Northway, Mead, & Moseley, 2004).
The nature of data yielded by these
two methods of collection differs. Brown
(1999) explained that FGs differ from IDI
interviews in that the “dynamic and in-
teractive exchange among participants”
in FGs lead them to produce “multiple
stories and diverse experiences” (p.
115). Fern (1982) found that those who
participated in IDI interviews generated
more ideas than did those participating
in either moderated or unmoderated
FGs. In a communications study, DeJong
and Schellens (1998) compared the use
of IDIs and FGs to evaluate the text in
a brochure about alcohol consumption
and found that IDI participants focused
on the finer details of the text, whereas
the interaction among FG participants
identified potential problems with the
brochure. Kaplowitz (2000, 2001) found
that IDI interview participants were
more likely to discuss sensitive topics
and stimulate discussion about dif-
ferent topics when compared to FG
participants. Kaplowitz and Hoehn
(2001) found that using FGs and IDI
interviews provided different perspec-
tives on resources, values, and issues
and concluded that one method was not
better than the other, but rather that the
two approaches were complementary. In
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546 Vol. 41, No. 5, September 2014 • Oncology Nursing Forum
an ethnographic study exploring adoles-
cent boys’ thoughts about sex, sequential
observations, FGs, and IDI interviews
were conducted with the same par-
ticipants (Wight, 1994). The adolescent
boys expressed greater sensitivity and
were more open when participating in
IDI interviews but displayed stronger
expressions of masculinity and were
more guarded when participating in FGs
(Wight, 1994).
Typically, researchers determine data
collection methods based on the best fit
with the research question. Both FGs
and IDI interviews may be intentionally
selected by researchers for the purpose
of data triangulation or may be selected
later in the research process as a result
of unanticipated challenges in data
collection. Lambert and Loiselle (2008)
explored patterns of cancer information-
seeking behavior and initially used both
IDI interviews and FGs as a result of
some participants’ inability or unwill-
ingness to participate in FGs. Purposeful
use of these two methods, however, was
later performed once preliminary study
findings revealed greater understanding
of the phenomenon. Three methodologic
observations were made about the data
derived: (a) comparing the data led to
an iterative process, whereby phenom-
ena were explored more deeply, (b)
the combined data led to an enhanced
understanding of the context of the
phenomena, and (c) convergence of the
data enhanced trustworthiness of find-
ings. The authors suggested that further
research was needed to understand how
various types of data contribute to un-
derstanding of phenomena (Lambert &
Loiselle, 2008).
Merits and Challenges
of Combined Use
Merits and challenges exist to us-
ing both IDI interviews and FGs in a
single study. Morse (2009) suggested
that mixing qualitative methods allows
for different perspectives that may oth-
erwise be overlooked. Two important
reasons should be considered in using
both FGs and IDI interviews. The first
is to increase participation of a broader
spectrum of eligible patients who might
not otherwise be able to participate if
restricted to one method of data collec-
tion (e.g., too ill to attend a FG). In that
scenario, the researcher must describe
both methods of data collection, the
number of participants who contributed
data via each approach, and comparison
of study data provided through the use
of each method.
The second reason is to increase the
validity of study findings through tri-
angulation and the collection of data
from all study participants using both
methods, beginning with IDI interviews
and followed by FGs, or vice versa. The
researcher must describe both methods
of data collection, compare the study
results from each method, and describe
how the data were integrated to arrive
at study results. The strength of this
consecutive method of data collection is
the opportunity to triangulate the data
and to perform member checking. A
limitation of this approach is the restric-
tion of study participants to only those
who can participate in both methods,
therefore narrowing the spectrum of
eligible patients.
Several challenges exist when per-
forming data triangulation with the
use of both FGs and IDI interviews.
Researchers must have a variety of
strategies to ensure data dependabil-
ity and credibility, such as debriefing,
member checking, triangulation, or use
of a reflexive journal. The assumption
that more data are always better over-
shadows concerns about what to do
with both types of data (Barbour, 1998).
Questions about the analysis of the data
may arise. For example, if using the two
methods, how are FG and IDI interview
data analyzed together? Do concerns
exist about the weighting of data? For
example, does one FG with six par-
ticipants carry the same weight as one
IDI interview? Morse (2009) suggested
that ad hoc combination of methods
threatens trustworthiness. Therefore,
the researcher performing data trian-
gulation must consider these issues and
analyze the data separately, synthesize
and identify similarities and differences,
and conclude how the different methods
affect the results.
Conclusion
Data triangulation using FGs and IDI
interviews in qualitative inquiry may
result in a broader understanding of the
phenomenon of interest. Limiting data
collection to one of the two methods
may result in the exclusion of eligible
patients and may lessen the breadth
of results by only gaining partial in-
sight into the phenomenon of interest.
Further examination of the potential
methodologic issues associated with
combining FG and IDI interview data is
needed to better understand the impli-
cations of this approach and to further
explore the differences between FG and
IDI interview data.
Nancy Carter, RN, PhD, is an assistant
professor in the School of Nursing at
McMaster University in Hamilton, On-
tario; Denise Bryant-Lukosius, RN, PhD,
is an associate professor in the School of
Nursing and Department of Oncology at
McMaster University, and clinician scien-
tist and director at the Canadian Centre of
Excellence in Oncology Advanced Practice
Nursing at the Juravinski Cancer Centre;
and Alba DiCenso, RN, PhD, is a professor
emeritus in the School of Nursing and the
Department of Clinical Epidemiology and
Biostatistics, Jennifer Blythe, PhD, is an as-
sociate professor in the School of Nursing,
and Alan J. Neville, MBChB, MEd, MRCP,
FRCP(c), is a professor in the Department
of Oncology and associate dean of educa-
tion in the Faculty of Health Sciences, all
at McMaster University, all in Canada. No
financial relationships to disclose. Carter
can be reached at carternm@mcmaster
.ca, with copy to editor at ONFEditor@
ons.org.
Key words: triangulation; in-depth indi-
vidual interviews; focus groups; qualita-
tive research
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Methods & Meanings
Methods & Meanings comments
and provides background on the
methodology used in one of the stud-
ies reported in the that month’s issue
of Oncology Nursing Forum. For more
information, contact Associate Editor
Diane G. Cope, PhD, ARNP, BC,
AOCNP®, at dgcope@comcast.net.
