Understanding Multitrait-Multimethod (MTMM) Design

The Multitrait-Multimethod (MTMM) matrix is a research design used to assess the construct validity of measurements. It involves measuring multiple traits using multiple methods.

Analyzing Statements about MTMM

• Statement A: Investigates construct validity
  This is correct. The primary purpose of the MTMM design is to examine construct validity by assessing convergent (high correlations between different methods measuring the same trait) and discriminant (low correlations between different methods measuring different traits) validity.
• Statement B: Associates with Coombs and Holladay
  This is incorrect. While Coombs and Holladay made significant contributions to psychological measurement, they are not the primary figures associated with the development of the MTMM matrix concept itself.
• Statement C: Associates with Campbell and Fiske
  This is correct. The MTMM matrix design was introduced and systematically developed by Donald T. Campbell and Donald W. Fiske in their seminal 1959 paper.
• Statement D: Investigates Composite reliability
  This statement is less precise. While reliability measures (like internal consistency or test-retest reliability) are crucial and are typically reported within an MTMM study, the core objective of the MTMM design itself is not to *investigate* reliability. Instead, it uses measures with known reliability to assess construct validity by separating trait variance from method variance.

Conclusion on Correct Associations

Based on the analysis, statements A and C accurately describe the Multitrait-Multimethod design and its origins.

Therefore, the correct option combines statements A and C.