This guide from USAID has been designed to provide guidance on the how to construct evaluation reports. It is also helpful for those who commission and review evaluation reports as a guide for what they should be looking for in a completed report.
USAID Center for Development Information and Evaluation, (2010). Constructing an evaluation report, Performance Monitoring & EvaluationTIPS Washington DC, USAID. Retrieved from website: http://transition.usaid.gov/policy/evalweb/documents/TIPS-ConstructinganEvaluationReport.pdf