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18 lines of insurance are examined in this section, with two or more different types of policies in some lines. The policies identified as "TDI" (example: Homeowners - TDI") are the policies promulgated by the Texas Department of Insurance and used exclusively in Texas prior to legislation that permitted companies to use ISO and company-proprietary forms. The forms identified as "ISO" are developed by the Insurance Services Office and approved for use in Texas. Insurance companies writing in Texas are required to tell TDI whether they will be using TDI-promulgated or ISO forms or they must file proprietary forms for approval prior to using.