Dear Wanny Eman , there are different kinds of case study:
Unique
Critical
Revelatory
Multiple
Exemplifying
The exemplifying case type is more appropriate for model generation. A classic example is Young, M. and Willmott, P. (1962) Family and Kinship in East London. Rev. ed.
Sure. You may wish to refer to my paper where I used in-depth semi structured interviews to develop a model which I subsequently tested using quantitative tools.
Singh, S., & Srivastava, P. (2019). Social media for outbound leisure travel: a framework based on technology acceptance model (TAM). Journal of Tourism Futures.
Yes, also in the domain of education it is possible to do a tentative model on the basis of case study results. One example about this: I have with my colleague constructed a collaborative, interactionist model of teacher change by integrating sociocultural and constructivist perspectives. Data was collected from the group of four future teachers, when they were co-planning, teaching and assessing mathematics lessons during their teaching practice. The article has been published in the journal Teaching and Teacher Education.
In statistics, there are three R's concerning data, that need to be treated with care: Reliability, Reproducibility and Repeatability. Case studies should not make an exception.
Singh, S., & Srivastava, P. (2019). Social media for outbound leisure travel: a framework based on technology acceptance model (TAM). Journal of Tourism Futures.