Suppose I want to develop one instrument. In the item creation stage I have found that for a particular construct "x", there is hardly any existing item. For another construct "y", I have found 20 items from existing instruments. Is there any norm for creating a minimum number of new items (where no existing item has been found) or select minimum number of items from existing instruments to cover all dimensions of a particular construct?
Hi Sujit,
I have found this paper very useful. It takes you through various steps for scale development including content validity.
Hinkin, T. R., Tracey, J. B., & Enz, C. A. (1997). Scale construction: Developing reliable and valid measurement instruments. Journal of Hospitality & Tourism Research, 21(1), 100-120.
Hope this helps.
Regards,
Gobinda
Hi Sujit,
When developing a tool, there are so many stages that are involved. Domains can be identified from literature while others can also be generated from the beneficiaries of the instrument. Culturally appropriate tools are constructed by generating items using semi-structured interviews and focus group discussions. After generating these items, content validity is then carried out. This could be followed by reliability tests and subsequently construct validity using exploratory factor analysis. If you need some references, I can send them to you.
Dr. Margaret Mweshi
Thank you Dr. Mweshi. I request you to add references related to generating items through semi structured interview and focus group discussion.
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