This chapter describes an ongoing process to define a suitable process improvement model for story cards based requirement engineering process and practices at agile software development environments. Key features of the SMM (Story card Maturity Model) process are: solves the problems related to the story cards like requirements conflicts, missing requirements, ambiguous requirements, define standard structure of story cards, to address non-functional requirements from exploration phase, and the use of a simplified and tailored assessment method for story cards based requirements engineering practices based on the CMM, which is poorly addressed at CMM. CMM does not cover how the quality of the requirements engineering process should be secured or what activities should be present for the requirements engineering process to achieve a certain maturity level. It is difficult to know what is not addressed or what could be done to improve the process. The authors also presents how can be the identified areas of improvement from assessment can be mapped with best knowledge based story cards practices for agile software development environments.