We do not say goodbye after our work is finished. On the contrary, we still support other teams — developers, programmers, designers — with the product development so that it would require less client's resources.
Developing a prototype or a design is just the beginning of the project. Supporting the development of requires much work and resources from the client. So after our part is finished we still take part in the development. It helps us to be sure that our work will be useful and won't be ruined by the realisation. We consult visual designers and developers and make sure the basic ideas are not lost.