https://innovationmanagement.se/imtool-articles/the-basics-of-creative-problem-solving-cps/

Kepner Tregoe’s Manual for Problem Solving 2003

https://hbr.org/2012/09/are-you-solving-the-right-problem

http://www.problemsolving2.com/problem_types/type_overview.htm

Treffinger, D. J., et al., Understanding individual problem-solving style: A key to learning and applying creative problem solving, Learning and Individual Differences (2007),

Janse, B. (2018). Problem Definition Process. Retrieved [insert date] from ToolsHero: https://www.toolshero.com/problem-solving/problem-definition-process/

https://www.matthewedgar.net/problem/

https://casestudies.mit.edu/problem-solving/

Michael Michalko ‘Thinkertoys’ (ISBN:978-0898154085)

https://www.skillsyouneed.com/ips/problem-solving2.html