This document discusses techniques for critical thinking. It introduces the problem solution framework and lists common questions to ask like what, why, how, who, where, and when. It also briefly mentions Immanuel Kant, a German philosopher who lived his entire life within 10 miles of his birthplace in Königsberg. The document notes that sometimes problems require finding a single solution that can address hundreds of issues, and provides a simple example of one starting point with letters and variables.