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	Historic/artistic and material/technical study Carrying out an in-depth study on the most relevant historic/artistic and material/technical aspects of a work must precede any direct intervention on the object itself. The inventory of the preserved stained glass and the study of their history is an essential initial step in order to know, appreciate and value our heritage. The study of the materials and their state of conservation is also fundamental to determine the most correct guidelines of the intervention.
	Stained glass C&R Direct intervention on historical stained glass must be considered as a scientific discipline which requires specific professional training. Its objectives, clearly different to those of the glass designer, glass artist and glazier are, firstly, the improvement of the conservation conditions of the work and, secondly, the restoration, as far as we considered it is possible, of the materials and values associated to it.
	Co-ordination and assessment in C&R projects In any conservation and restoration project on historical stained glass windows, a rigorous planning, co-ordination and supervision of every step and decisions of the process is necessary to determine the most advisable and less harmful methods and products used on the work. Keeping a detailed written, graphic and photographic documentation of the whole intervention process is also a necessary task, inseparable of the restoration process.
	Regular maintenance and inspection Any historical stained glass window should undergo regular control, inspection and maintenance in order to correct on time any anomaly which may arise and prevent the abandonment and pitiful state of a great part of our stained glass heritage. These inspections are the most effective way to guarantee the better conservation conditions of the work and avoid unnecessary restorations.
	Education Specialised training on stained glass conservation and restoration is still today one of the main needs in certain countries with a rich heritage. Training future conservators on this area must be a priority if we want to put this discipline on the same level as others areas related to conservation and save a valuable heritage in danger of being lost. In this way we might avoid that future interventions might be carried out on an obsolete and harmful craft basis.