1
Design Process - Cycles of Design

 

Above and below are supplemented diagrams (for Stages 1 & 2a and 3)
that have 10 modes of thinking-and-action (1A-1B, 2A-2B...) added.
{ You also can study a diagram with more details about the modes. }
2a
Design Process - Quality Checks

 

3b
Design Process - Cycles of Design