The aim of presentation is to propose advanced knowledge about an intervention performance and its effects on beneficiaries. Replicable and easy-to-follow solution in a form of recommended guidelines is offered. Discrimination of needs from other constructs (wants, preferences, and demand) is documented with examples from social services. Presentation focuses the attention on the importance of needs that are treated as a criterium for usefulness evaluation. The guidelines enable to focus the interventions on a merit of such needs.
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