  The development of a Cooperative Information System (CIS) becomes more and
more complex, new challenges arise for managing this complexity. So, the aspect
paradigm is regarded as a promising software development technique which can
reduce the complexity and cost of developing large software systems. This
opportunity can be used to develop a CIS able to support the interconnection of
organizations information systems in order to ensure a common global service
and to support the tempo of change in the business world that is increasing at
an exponential level. We previously proposed an approach named AspeCiS (An
Aspect-oriented Approach to Develop a Cooperative Information System) to
develop a Cooperative Information System from existing Information Systems by
using their artifacts such as existing requirements, and design. In this
approach we have studied how to elicit CIS Requirements called Cooperative
Requirements in AspeCiS. In this paper we propose a weaving process to define
these requirements by reusing existing requirements and new aspectual
requirements that we define to modify these requirements in order to be reused.
