Currently I am working on the development of a new scale. Kindly guide me on how to assess construct validity of a new scale.
I recommend Kane, M. T. (2013). Validiting the interpretations and uses of test scores. Journal of Educational Measurement, 50, 1-73.
and
Borsboom et al. (2004) The concept of validity. Psychological Review, 111, 1061-1071.
really its a decision about whether your test measures what you want it to measure. So you need to have a very good idea of the putative construct, there may be many other scales attempting to measure this as well.
You might take a look at this article
http://psychclassics.yorku.ca/Cronbach/construct.htm
I recommend Kane, M. T. (2013). Validiting the interpretations and uses of test scores. Journal of Educational Measurement, 50, 1-73.
and
Borsboom et al. (2004) The concept of validity. Psychological Review, 111, 1061-1071.
See:
Strauss, M. E., & Smith, G. T. (2009). Construct validity: advances in theory and methodology. Annual Review Of Clinical Psychology, 5, 1-25. doi: 10.1146/annurev.clinpsy.032408.153639
and the classic:
Campbell, D. T., & Fiske, D. W. (1959). Convergent and divergent validation by the multitrait-multimethod matrix. Psychological Bulletin, 56, 81-105.
MTMM is complicated but is the best way. However, before investing in such a hude endeavor I would establish inter-item reliability (Cronbach's), then establish discriminate validity with individual difference measures that are "like" the one you created by just using correlations.
Construct valdity is established using Principal component analysis method. You may require to understand PCA method prior to application.
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