In this paper we present a formal framework for analysis and optimisation of the requirements specifications of systems developed to apply in several countries. As different countries typically have different regulations/laws as well as different cultural restrictions, the corresponding specific requirements might differ in each particular case. Our framework provides a basis for (1) systematic and formal analysis of the diversity and interdependencies within the sets of the requirements, to avoid non-compliance, contradictions and redundancies; (2) corresponding systematic process for change management in the case of global system development.