The conservation of historic stained glass windows in America requires highly specialized expertise. The stained glass condition analysis must cover all of the materials of a stained glass window, that is, glass, came, decorative treatments, supports, frames, and protective materials. The condition analysis seeks to discover the causes of deterioration and to suggest remedies that will preserve the artistic and structural integrity of the window without requiring replacement for at least another century. Specifications for the restoration of stained glass must take into account all aspects of the restoration, from removal to reinstallation. This includes stipulating the requirements of basic good craftsmanship as well as the materials and procedures of specialized restoration techniques, such as paint consolidation or rejoining broken glass. The writing of good specifications demands intimate knowledge of each window in question, as well as the specifics of the craft and restoration of stained glass.