MHH Ch 2: Understanding and Applying Program Logic Models
McLaughlin J, GB Jordan (1999). Logic models: a tool for telling your programs performance story. Evaluation and Program Planning 22:65-72.
W.K. Kellogg Foundation Evaluation Handbook (Updated 2010). Chapters 7. Available for download at: http://www.wkkf.org/resource-directory/resource/2010/w-k-kellogg-foundation-evaluation-handbook
1 page single spaced summary in college level simple english