Similar to Maslow's Hierarchy of Needs (the Theory of Human Motivation), the Pyramid / Hierarchy of Skills is suggested. It includes 5 levels: Know, Play, Work, Solve, and Invent. Another classification includes roles: Student, Apprentice, Specialist, Expert, and Craftsman. Hierarchy of competence is analysed for Unconscious / Conscious Competence / Incompetence. "The craftsman represents the special human condition of being engaged." - Richard Sennett The work is inspired by two books: - Maslow A.H. A Theory of Human Motivation - Sennett R. The Craftsman. 2008.