40 Tex. Admin. Code § 819.154
When the CRD director determines that the alleged discriminatory practices contained in a complaint are pervasive or institutional in nature, or that the processing of the complaint may involve complex issues, questions of first impression, or may affect a large number of people, the CRD director may identify it as a pattern and practice complaint. This determination can be based on the face of the complaint or on information gathered in connection with an investigation. Pattern and practice investigations may focus not only on documenting facts involved in the complaint but also on review of other policies and procedures to ensure compliance with the nondiscrimination requirements of the Texas Fair Housing Act.
40 Tex. Admin. Code § 819.154