 These measures are then used to compute an index intended to represent the fit between the person and environment, such as an algebraic, absolute, or squared difference score, or are analyzed jointly to assess the effects of fit without computing a difference score (Edwards, 1991; Kristof-Brown et al., 2005).Characteristics of the person are generally measured through self-report while characteristics of the environment can be reported by the person or by others in the person's environment.French et al.