Which of the following patterns in a multitrait–multimethod matrix is most indicative of a serious problem with construct validity?

Question

BlackTom AI · Accepted Answer

Convergent validity requires that measures of the same trait assessed with different methods correlate more strongly than measures of different traits; discriminant validity requires that measures of different traits (even within the same method) have lower correlations. The multitrait–multimethod (MTMM) matrix is used to examine these patterns.

1. Relevant knowledge points and concepts
- Monotrait–heteromethod correlations: correlations between the same construct measured by different methods (tests convergent validity).
- Heterotrait–monomethod correlations: correlations between different constructs measured by the same method (indicate method variance).
- Heterotrait–heteromethod correlations: correlations between different constructs measured by different methods (reflect true discriminant validity).
- Ideal MTMM pattern: high monotrait–heteromethod correlations (convergent validity) and lower heterotrait correlations (discriminant validity).

2. Step-by-step reasoning
- If measures of the same trait across methods do not correlate strongly, convergent validity is lacking.
- If those same-trait correlations are weaker than correlations between different traits measured by different methods, the matrix shows that instruments fail to capture the intended construct more than they reflect differences among constructs. That is a fundamental validity failure.

3. Calculations / intermediate steps (illustrative)
- Suppose monotrait–heteromethod r = 0.30 and heterotrait–heteromethod r = 0.50.
- Difference = r(monotrait–heteromethod) − r(heterotrait–heteromethod) = 0.30 − 0.50 = −0.20.
- A negative difference indicates same-construct agreement is worse than cross-construct agreement — a serious validity problem.

4. Why the correct answer is correct
- The pattern described in option C (monotrait–heteromethod correlations weaker than heterotrait–heteromethod correlations) directly contradicts the basic requirement for convergent and discriminant validity in MTMM analysis. It implies that measures purported to assess the same construct are less related than measures of different constructs, so the construct validity is seriously compromised.

5. Why other options are incorrect (brief)
- High monotrait–heteromethod correlations with lower heterotrait correlations indicate good construct validity, not a problem.
- High heterotrait–monomethod correlations suggest method bias (a problem) but not as decisive a threat to construct validity as the monotrait–heteromethod < heterotrait–heteromethod pattern.
- Equal monotrait and heterotrait correlations indicate poor discriminant validity but still do not show the extreme reverse ordering in option C.

6. Conclusion
The most indicative pattern of a serious construct validity problem is C. Monotrait–heteromethod correlations are weaker than heterotrait–heteromethod correlations. This matches the provided answer.

Which of the following patterns in a multitrait–multimethod matrix is most indicative of a serious problem with construct validity?Single choice

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