Planning the evaluation can enable you to make the best of the skills and resources in your organisation. Good planning will increase the quality of the data produced, smooth the workflow and ensure that results are useful. It is better to have one coherent set of questionnaires than to keep going back to participants to ask them additional questions that were missed out of earlier evaluations. Similarly, it is better to have accurate information on a small number of key questions than to have incomplete or biased information on a large number of questions. A common guideline is that you should dedicate 10 per cent of the resources of a project to evaluation. Evaluation should be proportional to the scale of work. Don’t expect to measure change from a single workshop. A key element of the planning process is to consider how the evaluation proposed in this guide fits in with any existing evaluation that your organisation already carries out.