The strategic planning process for public or non-profit organizations also includes an assessment of the external environment with a focus on macroenvironmental forces and trends, key resource controllers (clients, customers, funding sources, regulators), competitors and competitive forces, and collaborators and collaborative sources, as indicated in the following graphic from John M. Bryson's guide to strategic planning.
See also chapter 9, Strategic Planning and the Strategic Change Cycle (Pages 240-273), by John M. Bryson, in the Jossey-Bass Handbook of Nonprofit Leadership and Management.