CGIAR’s Independent Advisory and Evaluation Service (IAES) provides operational support as the secretariat for the Independent Science for Development Council (ISDC) and the Standing Panel on Impact Assessment (SPIA), and implements CGIAR’s multi-year, independent evaluation plan as approved by the System Council. The IAES and the two independent bodies it supports, provide external, impartial, and expert advice related to strategy and positioning, program evaluation, and impact assessment.