Logic modelling

Logic modelling is a design tool that helps provide clear line of sight between your needs, inputs, activities and outcomes

The following video discusses Logic modelling. It runs for 3:31 minutes.


Evaluation Capacity Building - Logic Modelling from NSW CESE on Vimeo.

Transcript of Logic Modelling video.


A design tool

At its simplest, a logic model looks like a simple flow-chart:

  • Needs are about the problem at hand and why it’s important to address it.
  • Inputs are the things that contribute to addressing the need (usually a combination of money, time, expertise and resources).
  • Activities describe the things that the inputs allow to happen.
  • Outcomes are usually expressed in terms of measures of success such as 'what difference are we trying to make?

This image shows the progression from needs to inputs to activities and outcomes in a logic model.

Logic modelling can help guide the design process, as well as evaluation.

Developing a logic model helps us to:

  • design programs and initiatives that are responsive to needs and have a good chance of working
  • identify and express assumptions, which can then be validated or challenged by looking at the research, and/or tested in an evaluation
  • identify external factors that are beyond our control, but which may impact directly or indirectly on the effectiveness of the activities
  • identify possible ways the activities might derail or have negative consequences, so that we can guard against these, manage them actively and explore them in an evaluation
  • identify key process linkages that might be examined in a process evaluation
  • identify key results or markers of progress that we might want to look for in an outcome evaluation.

Logic modelling is best done by the people who are developing and implementing a program or policy with an experienced evaluator where available.

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