Pluralitas Non Est Ponenda Sine Necessitate

International documents and charters list matters to be considered when protecting built environment, but they do not tell how to evaluate them. Here, a model for evaluation is presented based on a complex and dynamic understanding of value. This model is concerted with a model for distribution of heritage goods according to kind of market. The idea of evaluators as experts is criticised as evaluation is always a unique and individual act. Only knowledge about criteria used in evaluation, not evaluating as such, can be accumulated and thereby professionalised.