The world's resource whose production, transport, refinement and consumption have increased incredibly more than all other ones is information. Organizations produce, exchange and consume more information every second. They need to share data with an increasing number of partners to manage their operations. This means that an organization must often adapt its information systems such that it can work with a new partner or because its current partners require it. These necessary adaptations must be made while the organization continues to operate and without causing any damage or disruptions. Thus, each organization must allocate an amount of resources to adapt its applications when required by its changing external environment. However, it may not be easy for an organization to know how many resources it needs for this. This is because of the multiplicity of dependencies and because of the uncoordinated nature of changes among all organizations. In this thesis, we propose a model to determine how many resources an organization needs to adapt to its evolving world. We also show how an organization can price an extension of the contractual adaptation time of its used external services.