This document summarizes the key principles of organizational structure according to Lex Sisney. It discusses 5 laws of organizational structure: 1) Change the structure when the strategy changes, 2) Don't let efficiency-focused functions control effectiveness-focused ones, 3) Don't let short-term focused functions control long-term ones, 4) Balance autonomy and control, and 5) Put the right people in the right roles. It then analyzes an example structure, finding issues like precedence over strategy, efficiency over effectiveness, and short-term over long-term control.