This research work analyzes some of the aspects related to the formal compliance of the preventive document used in construction sites in Spain, the Health and Safety Plan. For the present research work, the analysis is focused on several points related to the formal aspect of the document. The extracted results show on the one hand the scarce preventive planning that the work is done, hence its scarce validity at a preventive level, finding that only 10.64% of the analyzed Health and Safety Plans have a chronogram or organization chart of the different phases of the work. On the other hand, it is observed that it is a generic document, without specific guidelines or preventive procedures for the work to which they refer, finding for example that only 2.72% of the Health and Safety Plans consulted have graphic material related to the work or the machinery to be used in it, or that only 9.58% of the Health and Safety Plans integrate action guidelines in case of serious and imminent risk. That is the reason why it is of imperative necessity to create a living tool that updates the state of the work and that is accessible to all the agents involved in the constructive-preventive processes, whether they belong to the public or private entity. This tool must therefore integrate the constructive-preventive processes of the work