Choose the most appropriate from the options given below: 

Which of the following are correct about Multitrait-Multimethod design?
A. Investigates construct validity
B. Associates with Coombs and Holladay
C. Associates with Campbell and Fiske
D. Investigates Composite reliability

Correct option is B

The Multitrait-Multimethod (MTMM) matrix, developed by Campbell and Fiske (1959), is a statistical technique used to assess construct validity in psychological research.
    Statement A is correct: The MTMM design investigates construct validity by measuring multiple traits using multiple methods to determine whether the measures accurately reflect the constructs they intend to assess.
    Statement C is correct: The MTMM approach is associated with Campbell and Fiske, who introduced this framework to evaluate the validity of psychological tests.

Information Booster:
The MTMM Matrix is used in psychology, education, and social sciences to assess the validity of measurement instruments.

Key Components:
-    Convergent Validity: Measures of the same trait using different methods should correlate highly.
 -   Discriminant Validity: Measures of different traits should show low correlation.
  -  Method Bias Check: Helps determine if the method influences measurement results.
   - Reliability Testing: Ensures consistency of measurements.

Additional Information:
-Coombs and Holladay (B - Incorrect): Known for work in decision theory and scaling models.
-Composite Reliability (D - Incorrect): A measure used in structural equation modeling (SEM).