The link above does a good job of explaining a logic model. The example of the logic model for the tuberculosis control effort shows how important it is to distinguish between outputs and outcomes (in this model, outcomes are listed as effects). For this logic model, the output is how many patients begin, and how many finish treatment. The outcome is how many patients are cured, the reduction rate of TB, and overall health status of the population. This is a much better indicator of success for a non-profit. Just because a patient finishes treatment, doesn’t mean they are cured or that their finishing treatment will have a significant impact on the population as a whole. Focusing on outputs could make the organization look better than it really is. Also, notice that the effects box has an arrow connecting it to the purpose/mission. The outputs lead to the effects, but they are not directly linked to the purpose/mission.