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Using the high level consumer requirements for each subproject from step 2, the scope manager performs a preliminary functional size quote where suitable. Note that the functional size steps only the performance of the software equally important are the quality and technical requirements as detailed in action 4. The functional size of the program software application is the sum of all its subprojects.

If the practical requirements are too unclear, then the customer should do work to a minimum of identify the organization procedures to be supported by the software application. If a consumer can not state their needs, then a provider can not provide a proper option. Key Reference of subproject types (and also work such as assistance and repairs) are inappropriate for sizing with practical size measurement.

Function points are a "square foot" kind of step used to measure the practical user requirements for software, and without them, the work effort must be estimated utilizing another approach such as a per hour rate or historical-based estimate. It is very important to communicate to the client about which subprojects can and can not be sized utilizing functional size measurement.

It is well developed that the non-functional requirements for software application can significantly increase the work effort and cost of software advancement, however, typically these requirements are not determined up until far too late in the task to respond efficiently. "A tiny modification in Non-functional requirements (NFR) can trigger a substantial modification in the cost." (Boehm, 2005).

Southern, SCOPE does determine this as a step in their method. In this step, the client, with the support of the scope manager, prepares the RFP and examination criteria for the program and then issues it to a set of software application providers. The "laundry lists" of the high level functional and quality requirements allocated by sub-project are included as accessories to the RFP in order for providers to submit system prices quotes.

The customer chooses several suppliers to fulfill the program requirements. This is the initial step in northern, SCOPE where the scope supervisor does not play an active part The consumer works straight with the supplier(s) to develop and "flesh out" the requirements for the subprojects. The requirements files for those subprojects for which practical size is appropriate are the input to this step.