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Abstract. Software industries are pursuing the development of software intensive systems with a greater degree of re-use, reduction of costs, and shorter time to market. One of the successful approaches taken is based on the development of sets of similar systems where development efforts are shared. This approach is known as System Families. This article discusses an important issue in system family engineering activities: requirements modelling in system family context. The requirements must contain both the common and variable parts. Also, functional and non-functional aspects have to be considered in system family approach. Besides, an organization framework must be taken into account for requirements management. Some meta-models for these issues in system family are proposed and discussed. Based on the proposed model, a process for requirements management and development according to CMMI practices has been created.

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