This document discusses systems thinking for trustees. It notes that many modern leadership challenges are complex problems with non-linear and ambiguous factors. Systems thinking is defined as seeing wholes and relationships rather than isolated parts. Key aspects of systems thinking discussed include seeing the system from different perspectives, understanding cause-effect relationships, and looking for leverage points to improve performance. Quick fixes are cautioned against as unintended consequences may occur. Mind mapping and understanding leverage points like small interventions over time are presented as tools for systems thinking.