This report is a review of the evaluation of the London Initiative Zone (L.I.Z.) primary care development projects which were established through the former London Implementation Group (LIG) and which were in progress in 1995/6. It particularly focuses on the evaluation of revenue projects aimed at service development in primary care in inner London, exploring the nature of the L.I.Z. primary care development programme and how the evaluation of projects was developed to review their success. Examples are used to illustrate some of the work that is under way and to highlight some of the challenges both the health authorities and individuals involved in evaluating projects have faced and sought to overcome. Recommendations for action are included.