Completion of the preparatory stage - signing a contract for the development of software

If the decision is satisfied with the customer, then the customer and contractor conclude an agreement on the development (or modification) of the software product. The contractor receives a source of financing work and may officially start the project. As a rule, the customer becomes more accessible to the contractor, and the development process goes to the development stage.

The contractor must fix and place the technical solution agreed with the customer under the control of versions, which, along with the concept, should be a publicly available document, changed only for significant reasons.

My experience says that you should not combine the concept and preliminary technical solution. The concept is not intended for technical specialists, and the technical solution is focused on experts. In addition, as I indicated above, the concept may have several technical solutions. And in the subsequent stages of the development process, it may happen that you will have to revise the technical solution within the framework of the current concept. No need to knock out the support points from under themselves, they are never superfluous.