HERA is a key advocate of performance monitoring and evaluation and has developed substantial high-level expertise in this area. HERA has implemented more than 100 evaluations worldwide, covering a wide scope from project to sector through to the global level. HERA has reviewed evaluation methodologies used by many international development agencies, supported development agencies in preparing evaluation tools, tried out innovative approaches and developed its own tools. HERA continuously monitors health sector reform processes worldwide and has evaluated development aid at a global level for different organisations and agencies.