Needs Assessment models – presume that health services planning and funding should enable and support patients and citizens to access best practice care (including Preventions services). A needs-based model developed by Segal Is described in some detail in a recent publication by Segal At al [51]. Need is defined In this model by best practice care and prevention protocols, applied to the health status of the population. This is translated Into a health workforce allowing various options for mapping skills and competencies onto occupations. A Similar method is described by Ridoutt et al [52] Based on work by O'Connor and Van Konkelneberg (1995) [53]. This type Of approach offers an objective evidence-based approach to estimating health workforce need.