1) Edward de Bono
https://en.wikipedia.org/wiki/Edward_de_Bono

2) TRIZ Methods
Gadd, Karen. 2011. *TRIZ for Engineers: Enabling Inventive Problem
Solving*. John wiley & sons.
Savransky, Semyon D. 2000. *Engineering of Creativity: Introduction to TRIZ
Methodology of Inventive Problem Solving*. CRC press.

3) Design methods
https://en.wikipedia.org/wiki/Design_methods.