This is a good one to - "The Thinker's Toolkit: 14 Powerful Techniques for Problem Solving" by Morgan D. Jones, ( techniques as used by the CIA no less! :-) ).

This is a good one to - "The Thinker's Toolkit: 14 Powerful Techniques for Problem Solving" by Morgan D. Jones, ( techniques as used by the CIA no less! :-) ). https://www.amazon.com/Thinkers-Toolkit-Powerful-Techniques-Problem-dp-0812928083/dp/0812928083 https://www.amazon.com/Thinkers-Toolkit-Powerful-Techniques-...