This chapter examines one of the most daunting and controversial measures of transitional justice: personnel reforms of the state, which in different contexts and different eras have been conducted by means of lustration, vetting, purges, disbanding, de-Nazification, de-communisation and other types of personnel reforms. It starts by delineating the challenges of inherited personnel and explores the problematic solutions. It proceeds with a clarification of the terminology used to describe these solutions. The chapter classifies a variety of related measures in order to better understand their different origins, problems and effects. One of the most daunting challenges in the process of democratic consolidation is dealing with the personnel inherited from the previous undemocratic regimes. The chapter seeks to clarify the terminology by defining the umbrella concept of personnel reform and its offshoots. Different personnel change measures may have different origins, face different problems and produce different effects.