Dear Umema: I think there is no literature needed for your purpose if I had understood your question. An researcher has the right to score any activity or trait....etc 1-5 , 1- 10, 1- 20 or even 1 to 100. Then set the data and use your statistical test, there will be no problem at all. Wish you luck.

Umema Zafar , there is literature about scoring for pyschology with Bayesian methods that dates back to 1969:

https://link.springer.com/article/10.1007%2FBF02289358

For more recent papers, see for example:

https://www.frontiersin.org/articles/10.3389/fpsyg.2018.01240/full