This article introduces a special theme segment of CJPE that identifies and discusses various approaches to evaluation that support positivity. It also discusses why an approach to evaluation that supports positivity is basic to the objectives and raison d'être of evaluation — to contribute, generally in an indirect manner, to social betterment. This article identifies several lessons from psychology for approaches to evaluation: that positive reinforcement generally is more effective in achieving learning and behaviour change than negative reinforcement or punishment, and that intrinsic motivation, involving internalization of values, is necessary for commitment and the desire to make changes. The article indicates how a positivity focus to evaluation is consistent with the demands of accountability and the obligation of evaluators to tell the truth.