Brief synthesisThe watchmaking urban ensemble of La Chaux-de-Fonds and Le Locle demonstrates outstanding universal value as these twin manufacturing-towns constitute an exceptional example of organic urban ensembles entirely dedicated to a single industry. Criterion (iv): La Chaux-de-Fonds and Le Locle constitute a unique urban and architectural ensemble, wholly dedicated to watchmaking from the 18th century until the present day. Watchmaking space and living space co-exist in an extremely close relationship. The numerical indexes based on precise data in the evaluation of the integrity and authenticity of an urban ensemble are useful. Protection and management requirementsThe day-to-day management process is carried out by the Communes and their urban planning and heritage departments.