This document discusses the evolution of peace and stability operations from traditional peacekeeping to more complex, multidimensional missions. It outlines four types or generations of operations: 1) Observer missions like UNTSO, 2) Interposition forces like UNEF, 3) Multidimensional operations involving tasks beyond monitoring ceasefires, and 4) Transitional administrations providing interim governance as in East Timor and Kosovo. The document analyzes changing conflicts, peacekeeping roles and tasks, and debates defining generations of peace operations.