“…Although WPT programs are the primary means through which states have sought to improve staffing and, in turn, quality, no systematic empirical research has been conducted to examine the comparative influence of external and internal factors on the adoption decision. That WPT adoption may be related to such factors is reflected in prior research identifying significant associations between political, economic, programmatic, interstate, and federal-level factors with policies affecting Medicaid generally and nursing home reimbursement specifically (Allen, Pettus, and Haider-Markel 2004; Barrilleaux and Miller 1988; Davidson 1978; Grogan 1999; Harrington, Mullan, and Carrillo 2004; Harrington, Carrillo, et al 2000; Kane et al 1998; Kousser 2002; Miller 2005, 2006a, 2006b; Miller and Wang 2009a, 2009b; Pracht 2007; Swan, Harrington, and Pickard 2000; Swan et al 1997, 2001). …”