Product requirements are the starting point of the design stage. On this step we ask clients a lot of questions about the product and its goals. Requirements show:
 - What the product do?
 
 
- How it do that? 
 
 
- What user problems it solves? 
 
 
- What goals of the client it achieves?
For understanding the client's tasks, we suggest that first of all fill out the "
Questionnaire for collecting project requirements"
Output:Client receives documents with structured requirements for the product. 
Profit:
 This stage let you unambiguously fixate app functionality. 
 Synchronize our and client's vision of the product to be on the same page.