From the project management context, performance reviews can happen at the portfolio, program, project, people and process levels.
At the portfolio level, one focuses on the achievement of the business goals and the alignment of the portfolio.
At the program level, the focus of the performance reviews are on the overall achievement of the program goals.
Project level, the focus of the performance reviews are on the achievement of the project milestones.
People level, the performance reviews focuses on the achievement of key responsibilities.
At the process level, the focus is on the process performance.