The wall paintings decorating Saint Michael's cell at the Royal Monastry of Pedralbes, attributed to the painter Ferrer Bassa, are a remarkable set and show exceptional evidence of the Catalan Gothic painting scene. Due to its importance, the Museu d'Història de la Ciutat of Barcelona (MHCB), in charge of the conservation and restoration of the monastery's cultural goods since 1999, considered the appraisal of the conservation status of this work as an ineludibly responsibility. Thus, the Conservation and Restoration Department of the MHCB had started out the project 'Diagnosis and Proposal to the conservation-restoration of the wall paintings at Saint Michael's cell', creating a research team with a great budgetary investment.