Diagnostic algorithms for the recognition of diabetic angiopathies have been developed: an algorithm for the recognition of the most important syndromes of vascular involvement in patients with diabetes mellitus; an algorithm for the recognition of stages of diabetic retinopathy, and an algorithm for the recognition of stages of nephropathy. The algorithms are intended for a wide clinical use and mainly based on simple methods of research. More sophisticated methods extend the probability of the recognition of angiopathies. The use of the algorithms raise the efficacy of the recognition of angiopathies in demonstration experiments for teaching purposes.