Methodological proposal for the creation of an Information System of the Mudejar Architectural heritage in Aragon Marta Quintilla Castán [0000-0002-2308-752X] Pre-departmental Architecture Unit, University of Zaragoza, Zaragoza, Spain mquintilla@unizar.es Abstract. The architectural heritage requires highly complex processes due to the heterogeneity of scenarios, techniques, methodologies, tools and services to be developed by different technicians. This information should also be available for consultation at different stages, such as cataloguing, restoration or research. The solution is an Integral System that has a common support for the knowledge that can integrate the available materials, the processing and analysis of such ma- terials and the interventions to be performed. The information is referenced to a single updatable 3D model on which different information layers overlap, similar to the Geographic Information Systems and carried out under a semantic structure common to the Documentation and Management Systems. The objective of the research is to create a methodology, for the realization of a graphic database, that allows the inventory of a series of relevant buildings of the Mediterranean Gothic, specifically the so-called Mudejar style in Aragon, de- clared World Heritage Site by Unesco. Keywords: Information systems, web platform, 3D GIS, 3D model, cultural heritage. 1 Introduction Documentation of architectural heritage requires the storage of large amounts of infor- mation that must be stored and processed in very different formats, since it comes from experts from different areas of knowledge. This heterogeneity of information hinders communication between professionals involved in documentation, such as restaura- teurs, architects, engineers, archaeologists or historians, being the transfer of infor- mation between different entities, researchers or administrations, as well as the dissem- ination among the general public, one of the biggest problems to solve [1]. Inventories are required for multiple purposes, such as protection, restoration, con- servation, planning and education. The needs and requirements of the database structure and the type of information stored vary from one use to another. The first decision to make an inventory is to ask who is it for (experts, administration, etc.), what is going to be inventoried (objects, buildings, etc.), what use will it have (protection, restoration, conservation, etc.), how long will its development take and how much will it cost [2].