Part 1: Reasoning.- Introduction.- Trying to Define the Main Problem. Measurable Meaning.- A Formal Skeleton of Commonsense Reasoning.- Examples on the Analysis of Statements Through Design.- The Problem of Monotonicity and the Skeleton.- Conclusions For Part 1.- Part 2: From a Perceptive Point of View.- Introduction.- The Linguistic Continua.- Quasi-Transitivity.- Context, Inference's Safety, Proving and Further Comments.- Conclusions for Part 2.- Part 3: Fuzzy Calculi, the Context and Historical Roots.- An Overview on Fuzzy Calculi.- Common Reasoning in a Computational Context.- Looking for Some Historical Roots.- The End: General Conclusions.