Definitions of critical thinking:

What is critical thinking? (University of Greenwich)

History of the concept:

Rutherford,  A. (2018). Models For Critical Thinking: A Fundamental Guide to Effective Decision Making, Deep Analysis, Intelligent Reasoning, and Independent Thinking: 1, Independently Published.

Definitions of strategic thinking:

What is strategic thinking?

How to develop planning skills? (University of Strathclyde Glasgow)