This document discusses Patrick Geddes' theory of evolution in cities and planning theory more broadly. It covers the following key ideas:
1) Geddes advocated for a "survey-analysis-plan" approach to city planning that involved a comprehensive survey of local conditions before developing plans.
2) Early planning approaches focused on physical and technical solutions but have since incorporated more social and political considerations.
3) Rational planning approaches based on systems analysis gave way to recognition of the inherent politics and values in planning.
4) Advocacy planning sought to involve more voices in planning, but participation has been criticized as tokenism at times.