Purpose. The 5-Year and Annual PHA Plans provide a ready source for interested parties to locate basic PHA policies, rules, and requirements concerning the PHA’s operations, programs, and services, including changes to these policies, and informs HUD, families served by the PHA, and members of the public of the PHA’s mission, goals and objectives for serving the needs of low- income, very low- income, and extremely low- income families. Applicability.