Differences between the Theory of Change and the Logic Model Mar 14, 2016The approach when shown as a matrix is called a log frame and when shown as a flow chart it is sometimes called a logic model. Throughout this article I will use both terms interchangeably. Now let’s get down to business by highlighting the differences between the ToC and the Log frame.[DOC] wwwthscotland Web view1. Driver diagrams work back from the project, whereas logic models work backwards from the outcome. Consequently, logic models may be better at helping planners priorities based on outcomes2. Logic models which have been created by NHS Health Scotland are underpinned by evidence, driver diagrams are informed by expert opinion3.