Title insurance protects the property owner against any flaws that may not have been found by the title searcher when the land and/or house were purchased. Title insurance surveys and plans provide information relied upon by title insurance companies to insure title of the real property to be free and clear of survey matters, except those disclosed by the survey and indicated on the plan. Since title insurance policies often include a survey exception for residential properties, title insurance surveys are usually required only for commercial properties. Recognized standards for title insurance surveys are contained in the "Minimum Standard Detail Requirements and Classifications for ALTA/ACSM Land Title Surveys" as adopted by the American Land Title Association and the American Congress on Surveying and Mapping, and as last amended in 1992.