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<span id="openzim-page-title" class="mw-page-title-main"><span class="mw-page-title-main">Construct validity</span></span>
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<p><b>Construct validity</b> concerns how well a set of <a href="Operationalization" title="Operationalization">indicators represent or reflect a concept that is not directly measurable</a>.<sup id="cite_ref-Cronbach55_1-0" class="reference"><a href="#cite_note-Cronbach55-1"><span class="cite-bracket">[</span>1<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-Quasi-experimentation_2-0" class="reference"><a href="#cite_note-Quasi-experimentation-2"><span class="cite-bracket">[</span>2<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-3" class="reference"><a href="#cite_note-3"><span class="cite-bracket">[</span>3<span class="cite-bracket">]</span></a></sup> <i>Construct validation</i> is the accumulation of evidence to support the interpretation of what a measure reflects.<sup id="cite_ref-Cronbach55_1-1" class="reference"><a href="#cite_note-Cronbach55-1"><span class="cite-bracket">[</span>1<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-4" class="reference"><a href="#cite_note-4"><span class="cite-bracket">[</span>4<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-5" class="reference"><a href="#cite_note-5"><span class="cite-bracket">[</span>5<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-Polit_6-0" class="reference"><a href="#cite_note-Polit-6"><span class="cite-bracket">[</span>6<span class="cite-bracket">]</span></a></sup> Modern validity theory defines construct validity as the overarching concern of validity research, subsuming all other types of validity evidence<sup id="cite_ref-messick1995_7-0" class="reference"><a href="#cite_note-messick1995-7"><span class="cite-bracket">[</span>7<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-Schotte97_8-0" class="reference"><a href="#cite_note-Schotte97-8"><span class="cite-bracket">[</span>8<span class="cite-bracket">]</span></a></sup> such as <a href="Content_validity" title="Content validity">content validity</a> and <a href="Criterion_validity" title="Criterion validity">criterion validity</a>.<sup id="cite_ref-guion1980_9-0" class="reference"><a href="#cite_note-guion1980-9"><span class="cite-bracket">[</span>9<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-Brown86_10-0" class="reference"><a href="#cite_note-Brown86-10"><span class="cite-bracket">[</span>10<span class="cite-bracket">]</span></a></sup>
</p><p>Construct validity is the appropriateness of inferences made on the basis of observations or measurements (often test scores), specifically whether a test can reasonably be considered to reflect the intended <a href="Construct_(Philosophy_of_Science)" class="mw-redirect" title="Construct (Philosophy of Science)">construct</a>. Constructs are abstractions that are deliberately created by researchers in order to conceptualize the <a href="Latent_variable" class="mw-redirect" title="Latent variable">latent variable</a>, which is correlated with scores on a given measure (although it is not directly observable). Construct validity examines the question: Does the measure behave like the theory says a measure of that construct should behave?
</p><p>Construct validity is essential to the perceived overall validity of the test. Construct validity is particularly important in the <a href="Social_sciences" class="mw-redirect" title="Social sciences">social sciences</a>, <a href="Psychology" title="Psychology">psychology</a>, <a href="Psychometrics" title="Psychometrics">psychometrics</a> and language studies.
</p><p>Psychologists such as <a href="Samuel_Messick" title="Samuel Messick">Samuel Messick</a> (1998) have pushed for a unified view of construct validity "...as an integrated evaluative judgment of the degree to which empirical evidence and theoretical rationales support the adequacy and appropriateness of inferences and actions based on test scores..."<sup id="cite_ref-Messick_11-0" class="reference"><a href="#cite_note-Messick-11"><span class="cite-bracket">[</span>11<span class="cite-bracket">]</span></a></sup> While Messick's views are popularized in educational measurement and originated in a career around explaining validity in the context of the testing industry, a definition more in line with foundational psychological research, supported by data-driven empirical studies that emphasize statistical and causal reasoning was given by (Borsboom et al., 2004).<sup id="cite_ref-12" class="reference"><a href="#cite_note-12"><span class="cite-bracket">[</span>12<span class="cite-bracket">]</span></a></sup>
</p><p>Key to construct validity are the theoretical ideas behind the trait under consideration, i.e., the concepts that organize how aspects of <a href="Personality" title="Personality">personality</a>, <a href="Intelligence" title="Intelligence">intelligence</a>, etc. are viewed.<sup id="cite_ref-Pennington_13-0" class="reference"><a href="#cite_note-Pennington-13"><span class="cite-bracket">[</span>13<span class="cite-bracket">]</span></a></sup> <a href="Paul_Meehl" class="mw-redirect" title="Paul Meehl">Paul Meehl</a> states that, "The best construct is the one around which we can build the greatest number of inferences, in the most direct fashion."<sup id="cite_ref-Cronbach55_1-2" class="reference"><a href="#cite_note-Cronbach55-1"><span class="cite-bracket">[</span>1<span class="cite-bracket">]</span></a></sup>
</p><p>Scale purification, i.e., "the process of eliminating items from multi-item scales" (Wieland et al., 2017), can influence construct validity. A framework presented by Wieland et al. (2017) highlights that both statistical and judgmental criteria need to be taken under consideration when making scale purification decisions.<sup id="cite_ref-14" class="reference"><a href="#cite_note-14"><span class="cite-bracket">[</span>14<span class="cite-bracket">]</span></a></sup>
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<div class="mw-heading mw-heading2"><h2 id="History">History</h2></div>
<p>Throughout the 1940s scientists had been trying to come up with ways to validate experiments prior to publishing them. The result of this was a plethora of different validities (intrinsic validity, <a href="Face_validity" title="Face validity">face validity</a>, <a href="Logical_validity" class="mw-redirect" title="Logical validity">logical validity</a>, empirical validity, etc.). This made it difficult to tell which ones were actually the same and which ones were not useful at all. Until the middle of the 1950s, there were very few universally accepted methods to validate psychological experiments. The main reason for this was because no one had figured out exactly which qualities of the experiments should be looked at before publishing. Between 1950 and 1954 the APA Committee on Psychological Tests met and discussed the issues surrounding the validation of psychological experiments.<sup id="cite_ref-Cronbach55_1-3" class="reference"><a href="#cite_note-Cronbach55-1"><span class="cite-bracket">[</span>1<span class="cite-bracket">]</span></a></sup>
</p><p>Around this time the term construct validity was first coined by <a href="Paul_Meehl" class="mw-redirect" title="Paul Meehl">Paul Meehl</a> and <a href="Lee_Cronbach" title="Lee Cronbach">Lee Cronbach</a> in their seminal article "Construct Validity In Psychological Tests". They noted the idea that construct validity was not new at that point; rather, it was a combination of many different types of validity dealing with theoretical concepts. They proposed the following three steps to evaluate construct validity:
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<ol><li>articulating a set of theoretical concepts and their interrelations</li>
<li>developing ways to measure the hypothetical constructs proposed by the theory</li>
<li>empirically testing the hypothesized relations<sup id="cite_ref-Cronbach55_1-4" class="reference"><a href="#cite_note-Cronbach55-1"><span class="cite-bracket">[</span>1<span class="cite-bracket">]</span></a></sup></li></ol>
<p>Many psychologists noted that an important role of construct validation in <a href="Psychometrics" title="Psychometrics">psychometrics</a> was that it placed more emphasis on theory as opposed to validation. This emphasis was designed to address a core requirement that validation include some demonstration that the test measures the theoretical construct it purported to measure. Construct validity has three aspects or components: the substantive component, structural component, and external component.<sup id="cite_ref-Loevinger_15-0" class="reference"><a href="#cite_note-Loevinger-15"><span class="cite-bracket">[</span>15<span class="cite-bracket">]</span></a></sup> They are closely related to three stages in the test construction process: constitution of the pool of items, analysis and selection of the internal structure of the pool of items, and correlation of test scores with criteria and other variables.
</p><p>In the 1970s there was growing debate between theorists who began to see construct validity as the dominant model pushing towards a more unified theory of validity, and those who continued to work from multiple validity frameworks.<sup id="cite_ref-Kane06_16-0" class="reference"><a href="#cite_note-Kane06-16"><span class="cite-bracket">[</span>16<span class="cite-bracket">]</span></a></sup> Many psychologists and education researchers saw "predictive, concurrent, and content validities as essentially <i>ad hoc</i>, construct validity was the whole of validity from a scientific point of view"<sup id="cite_ref-Loevinger_15-1" class="reference"><a href="#cite_note-Loevinger-15"><span class="cite-bracket">[</span>15<span class="cite-bracket">]</span></a></sup> In the 1974 version of <i>The <a href="Standards_for_Educational_and_Psychological_Testing" title="Standards for Educational and Psychological Testing">Standards for Educational and Psychological Testing</a></i> the inter-relatedness of the three different aspects of validity was recognized: "These aspects of validity can be discussed independently, but only for convenience. They are interrelated operationally and logically; only rarely is one of them alone important in a particular situation".
</p><p>In 1989 Messick presented a new conceptualization of construct validity as a unified and multi-faceted concept.<sup id="cite_ref-Messick89_17-0" class="reference"><a href="#cite_note-Messick89-17"><span class="cite-bracket">[</span>17<span class="cite-bracket">]</span></a></sup> Under this framework, all forms of validity are connected to and are dependent on the quality of the construct. He noted that a unified theory was not his own idea, but rather the culmination of debate and discussion within the scientific community over the preceding decades. There are six aspects of construct validity in Messick's unified theory of construct validity:<sup id="cite_ref-Messick95_18-0" class="reference"><a href="#cite_note-Messick95-18"><span class="cite-bracket">[</span>18<span class="cite-bracket">]</span></a></sup>
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<ol><li><b>Consequential</b> – What are the potential risks if the scores are invalid or inappropriately interpreted? Is the test still worthwhile given the risks?</li>
<li><b>Content</b> – Do test items appear to be measuring the construct of interest?</li>
<li><b>Substantive</b> – Is the theoretical foundation underlying the construct of interest sound?</li>
<li><b>Structural</b> – Do the interrelationships of dimensions measured by the test correlate with the construct of interest and test scores?</li>
<li><b>External</b> – Does the test have convergent, discriminant, and predictive qualities?</li>
<li><b>Generalizability</b> – Does the test generalize across different groups, settings and tasks?</li></ol>
<p>How construct validity should properly be viewed is still a subject of debate for validity theorists. The core of the difference lies in an <a href="Epistemology" title="Epistemology">epistemological</a> difference between <a href="Positivist" class="mw-redirect" title="Positivist">positivist</a> and <a href="Postpositivist" class="mw-redirect" title="Postpositivist">postpositivist</a> theorists.
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<div class="mw-heading mw-heading2"><h2 id="Evaluation">Evaluation</h2></div>
<p>Evaluation of construct validity requires that the correlations of the measure be examined in regard to variables that are known to be related to the construct (purportedly measured by the instrument being evaluated or for which there are theoretical grounds for expecting it to be related). This is consistent with the <a href="Multitrait-multimethod_matrix" title="Multitrait-multimethod matrix">multitrait-multimethod matrix</a> (MTMM) of examining construct validity described in Campbell and Fiske's landmark paper (1959).<sup id="cite_ref-Campbell_19-0" class="reference"><a href="#cite_note-Campbell-19"><span class="cite-bracket">[</span>19<span class="cite-bracket">]</span></a></sup> There are other methods to evaluate construct validity besides MTMM. It can be evaluated through different forms of <a href="Factor_analysis" title="Factor analysis">factor analysis</a>, <a href="Structural_equation_modeling" title="Structural equation modeling">structural equation modeling</a> (SEM), and other statistical evaluations.<sup id="cite_ref-Hammond96_20-0" class="reference"><a href="#cite_note-Hammond96-20"><span class="cite-bracket">[</span>20<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-21" class="reference"><a href="#cite_note-21"><span class="cite-bracket">[</span>21<span class="cite-bracket">]</span></a></sup> It is important to note that a single study does not prove construct validity. Rather it is a continuous process of evaluation, reevaluation, refinement, and development. Correlations that fit the expected pattern contribute evidence of construct validity. Construct validity is a judgment based on the accumulation of correlations from numerous studies using the instrument being evaluated.<sup id="cite_ref-22" class="reference"><a href="#cite_note-22"><span class="cite-bracket">[</span>22<span class="cite-bracket">]</span></a></sup>
</p><p>Most researchers attempt to test the construct validity before the main research. To do this <a href="Pilot_studies" class="mw-redirect" title="Pilot studies">pilot studies</a> may be utilized. Pilot studies are small scale preliminary studies aimed at testing the feasibility of a full-scale test. These pilot studies establish the strength of their research and allow them to make any necessary adjustments. Another method is the known-groups technique, which involves administering the measurement instrument to groups expected to differ due to known characteristics. Hypothesized relationship testing involves logical analysis based on theory or prior research.<sup id="cite_ref-Polit_6-1" class="reference"><a href="#cite_note-Polit-6"><span class="cite-bracket">[</span>6<span class="cite-bracket">]</span></a></sup> Intervention studies are yet another method of evaluating construct validity. Intervention studies where a group with low scores in the construct is tested, taught the construct, and then re-measured can demonstrate a test's construct validity. If there is a significant difference pre-test and post-test, which are analyzed by statistical tests, then this may demonstrate good construct validity.<sup id="cite_ref-23" class="reference"><a href="#cite_note-23"><span class="cite-bracket">[</span>23<span class="cite-bracket">]</span></a></sup>
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<div class="mw-heading mw-heading3"><h3 id="Convergent_and_discriminant_validity">Convergent and discriminant validity</h3></div>
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</style><div role="note" class="hatnote navigation-not-searchable">Main articles: <a href="Convergent_validity" title="Convergent validity">convergent validity</a> and <a href="Discriminant_validity" title="Discriminant validity">discriminant validity</a></div>
<p>Convergent and discriminant validity are the two subtypes of validity that make up construct validity. Convergent validity refers to the degree to which two measures of constructs that theoretically should be related, are in fact related. In contrast, discriminant validity tests whether concepts or measurements that are supposed to be unrelated are, in fact, unrelated.<sup id="cite_ref-Campbell_19-1" class="reference"><a href="#cite_note-Campbell-19"><span class="cite-bracket">[</span>19<span class="cite-bracket">]</span></a></sup> Take, for example, a construct of general happiness. If a measure of general happiness had convergent validity, then constructs similar to happiness (satisfaction, contentment, cheerfulness, etc.) should relate positively to the measure of general happiness. If this measure has discriminant validity, then constructs that are not supposed to be related positively to general happiness (sadness, depression, despair, etc.) should not relate to the measure of general happiness. Measures can have one of the subtypes of construct validity and not the other. Using the example of general happiness, a researcher could create an inventory where there is a very high positive correlation between general happiness and contentment, but if there is also a significant positive correlation between happiness and depression, then the measure's construct validity is called into question. The test has convergent validity but not discriminant validity.
</p>
<div class="mw-heading mw-heading3"><h3 id="Nomological_network">Nomological network</h3></div>
<div role="note" class="hatnote navigation-not-searchable">Main article: <a href="Nomological_network" title="Nomological network">nomological network</a></div>
<p>Lee Cronbach and Paul Meehl (1955)<sup id="cite_ref-Cronbach55_1-5" class="reference"><a href="#cite_note-Cronbach55-1"><span class="cite-bracket">[</span>1<span class="cite-bracket">]</span></a></sup> proposed that the development of a nomological net was essential to the measurement of a test's construct validity. A <a href="Nomological_network" title="Nomological network">nomological network</a> defines a construct by illustrating its relation to other constructs and behaviors. It is a representation of the concepts (constructs) of interest in a study, their observable manifestations, and the interrelationship among them. It examines whether the relationships between similar construct are considered with relationships between the observed measures of the constructs. A thorough observation of constructs relationships to each other it can generate new constructs. For example, <a href="Intelligence" title="Intelligence">intelligence</a> and <a href="Working_memory" title="Working memory">working memory</a> are considered highly related constructs. Through the observation of their underlying components psychologists developed new theoretical constructs such as: controlled attention<sup id="cite_ref-24" class="reference"><a href="#cite_note-24"><span class="cite-bracket">[</span>24<span class="cite-bracket">]</span></a></sup> and short term loading.<sup id="cite_ref-25" class="reference"><a href="#cite_note-25"><span class="cite-bracket">[</span>25<span class="cite-bracket">]</span></a></sup> Creating a nomological net can also make the observation and measurement of existing constructs more efficient by pinpointing errors.<sup id="cite_ref-Cronbach55_1-6" class="reference"><a href="#cite_note-Cronbach55-1"><span class="cite-bracket">[</span>1<span class="cite-bracket">]</span></a></sup> Researchers have found that studying the bumps on the human skull (<a href="Phrenology" title="Phrenology">phrenology</a>) are not indicators of intelligence, but volume of the brain is. Removing the theory of phrenology from the nomological net of intelligence and adding the theory of brain mass evolution, constructs of intelligence are made more efficient and more powerful. The weaving of all of these interrelated concepts and their observable traits creates a "net" that supports their theoretical concept. For example, in the nomological network for academic achievement, we would expect observable traits of academic achievement (i.e., GPA, SAT, and ACT scores) to relate to the observable traits for studiousness (hours spent studying, attentiveness in class, detail of notes). If they do not then there is a problem with measurement (of <a href="Academic_achievement" title="Academic achievement">academic achievement</a> or studiousness), or with the purported theory of achievement. If they are indicators of one another then the nomological network, and therefore the constructed theory, of academic achievement is strengthened. Although the nomological network proposed a theory of how to strengthen constructs, it doesn't tell us how we can assess the construct validity in a study.
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<div class="mw-heading mw-heading3"><h3 id="Multitrait-multimethod_matrix">Multitrait-multimethod matrix</h3></div>
<div role="note" class="hatnote navigation-not-searchable">Main article: <a href="Multitrait-multimethod_matrix" title="Multitrait-multimethod matrix">Multitrait-multimethod matrix</a></div>
<p>The <a href="Multitrait-multimethod_matrix" title="Multitrait-multimethod matrix">multitrait-multimethod matrix</a> (MTMM) is an approach to examining construct validity developed by Campbell and Fiske (1959).<sup id="cite_ref-Campbell_19-2" class="reference"><a href="#cite_note-Campbell-19"><span class="cite-bracket">[</span>19<span class="cite-bracket">]</span></a></sup> This model examines convergence (evidence that different measurement methods of a construct give similar results) and discriminability (ability to differentiate the construct from other related constructs). It measures six traits: the evaluation of convergent validity, the evaluation of discriminant (divergent) validity, trait-method units, multitrait-multimethods, truly different methodologies, and trait characteristics. This design allows investigators to test for: "convergence across different measures...of the same 'thing'...and for divergence between measures...of related but conceptually distinct 'things'.<sup id="cite_ref-Quasi-experimentation_2-1" class="reference"><a href="#cite_note-Quasi-experimentation-2"><span class="cite-bracket">[</span>2<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-26" class="reference"><a href="#cite_note-26"><span class="cite-bracket">[</span>26<span class="cite-bracket">]</span></a></sup>
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<div class="mw-heading mw-heading2"><h2 id="Threats_to_construct_validity">Threats to construct validity</h2></div>
<p>Apparent construct validity can be misleading due to a range of problems in hypothesis formulation and experimental design.
</p>
<ul><li><b>Hypothesis guessing</b>: If the participant knows, or guesses, the desired end-result, the participant's actions may change.<sup id="cite_ref-27" class="reference"><a href="#cite_note-27"><span class="cite-bracket">[</span>27<span class="cite-bracket">]</span></a></sup> An example is the <a href="Hawthorne_effect" title="Hawthorne effect">Hawthorne effect</a>: in a 1925 industrial ergonomics study conducted at the Hawthorne Works factory outside Chicago, experimenters observed that both lowering <i>and</i> brightening the ambient light levels improved worker productivity. They eventually determined the basis for this paradoxical result: workers who were aware of being observed worked harder no matter what the change in the environment.</li>
<li><b>Bias in experimental design</b> (intentional or unintentional). An example of this is provided in <a href="Stephen_Jay_Gould" title="Stephen Jay Gould">Stephen Jay Gould</a>'s 1981 book "<a href="The_Mismeasure_of_Man" title="The Mismeasure of Man">The Mismeasure of Man</a>".<sup id="cite_ref-28" class="reference"><a href="#cite_note-28"><span class="cite-bracket">[</span>28<span class="cite-bracket">]</span></a></sup> Among the questions used around the time of World War I in the battery used to measure intelligence was "In which city do the Dodgers play?" (they were then based in Brooklyn). Recent immigrants to the US from Eastern Europe unfamiliar with the sport of baseball got the answer wrong, and this was used to infer that Eastern Europeans had lower intelligence. The question did not measure intelligence: it only measured how long one had lived in the US and become accultured to a popular pastime.</li>
<li><b>Researcher expectations</b> may be communicated unintentionally to the participants non-verbally, eliciting the desired effect. To control for this possibility, <a href="Double-blind" class="mw-redirect" title="Double-blind">double-blind</a> experimental designs should be used where possible. That is, the evaluator of a particular participant should be unaware of what intervention has been performed on that particular participant or should be independent of the experimenter.</li>
<li><b>Defining predicted outcome too narrowly</b>.<sup id="cite_ref-29" class="reference"><a href="#cite_note-29"><span class="cite-bracket">[</span>29<span class="cite-bracket">]</span></a></sup> For instance, using only <a href="Job_satisfaction" title="Job satisfaction">job satisfaction</a> to measure happiness will exclude relevant information from outside the workplace.</li>
<li><b><a href="Confounding" title="Confounding">Confounding variables</a></b> (covariates): The root cause for the observed effects may be due to variables that have not been considered or measured.<sup id="cite_ref-30" class="reference"><a href="#cite_note-30"><span class="cite-bracket">[</span>30<span class="cite-bracket">]</span></a></sup></li></ul>
<p>An in-depth exploration of the threats to construct validity is presented in Trochim.<sup id="cite_ref-Trochim,_William_M._31-0" class="reference"><a href="#cite_note-Trochim,_William_M.-31"><span class="cite-bracket">[</span>31<span class="cite-bracket">]</span></a></sup>
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<div class="mw-heading mw-heading2"><h2 id="See_also">See also</h2></div>
<ul><li><a href="Statistical_conclusion_validity" title="Statistical conclusion validity">Statistical conclusion validity</a></li>
<li><a href="Internal_validity" title="Internal validity">Internal validity</a></li>
<li><a href="Ecological_validity" title="Ecological validity">Ecological validity</a></li>
<li><a href="Content_validity" title="Content validity">Content validity</a></li>
<li><a href="External_validity" title="External validity">External validity</a></li>
<li><a href="Reliability_(psychometrics)" class="mw-redirect" title="Reliability (psychometrics)">Reliability (psychometrics)</a></li>
<li><a href="Face_validity" title="Face validity">Face validity</a></li>
<li><a href="Logical_validity" class="mw-redirect" title="Logical validity">Logical validity</a></li>
<li><a href="Jingle-jangle_fallacies" title="Jingle-jangle fallacies">Jingle-jangle fallacies</a></li>
<li><a href="Lee_J._Cronbach" class="mw-redirect" title="Lee J. Cronbach">Lee J. Cronbach</a></li>
<li><a href="Paul_E._Meehl" title="Paul E. Meehl">Paul E. Meehl</a></li></ul>
<div class="mw-heading mw-heading2"><h2 id="References">References</h2></div>
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<div class="mw-heading mw-heading2"><h2 id="External_links">External links</h2></div>
<ul><li><a rel="nofollow" class="external text" href="http://art.unt.edu/designresearchcenter/sites/default/files/articles/research_v2_ryan_gupta_hermosillo.pdf/">Useful reference guide for research terms</a></li>
<li><a rel="nofollow" class="external text" href="http://www.socialresearchmethods.net/kb/nomonet.php/">Provides a visual representation of the nomological network</a></li></ul></div><!--htdig_noindex--><div><div class="zim-footer">
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