Notes and presentation slides from Evaluation 2009 Think Tank Session 455. This think tank challenged participants to think of systems and logic models as complementary tools for evaluation. Examples of both types of models, as well as an example of an integrated model, were used as the basis for group discussion. Notes include the models. PowerPoint slides include notes from the think tank discussion that followed the presentation.#ProgramTheoryandTheoryDrivenEvaluation #SystemsinEvaluation #2009Conference #models #Logic