Documentation and recording work is a key role in a conservation and restoration plan of cultural heritage. Documentation is linked to all the phases of a project, from its preparation and evolution to its conclusions, and is a faithful testimony of the results obtained. The study on the Colonial Missions in the State of Chihuahua, Mexico, that we present is a good indication of this. After one decade of the work, the Documentation and Records Laboratory of the Heritage Conservation Institute at the Polytechnic University of Valencia (UPV) attempted to experiment its analysis methodology and study in a totally different work setting from the usual settings. The conclusions drawn in our research project will unquestionable improve our actions in the future.