Two user-friendly guidelines, aimed at stakeholders, managers, conservators and marine archaeologists who are responsible for the protection of shipwreck and other historic wooden constructions in marine environment will be developed with information from WP 1 and WP 2. One guideline is for the assessment / prediction of decay. The second is a guideline for the physical protection of wreck, and will be of interest for the preservation of wrecks in all-marine environments, including the Mediterranean. The guideline will include a cost-benefit analysis. Both guidelines will be integrated into the EU MACHU project.