Data were obtained from a survey of county prosecutors in Wisconsin and Michigan, with 77 prosecutors responding -- 50 percent of the total available in the two States. Respondents were asked to rate the importance of a series of reasons listed for plea negotiations. The plea-negotiation reasons given can be categorized as follows: legal problems (errors in arrest or search procedures, problems in obtaining witness testimony, statute of limitations, etc.), limited resources available to take a case to full trial, individualized justice (permits dealing with defendants according to their individual circumstances), and the prosecutors' desire to ameliorate legislative overcriminalization. The predominant reasons cited by prosecutors were categorized as legal problems; somewhat less important was limited resources. The more experienced part-time prosecutors with liberal political perspectives are most likely to state that workload and limited resources favor plea negotiations, while rural part-time prosecutors focus on individualizing justice; overcriminalization is the reason for plea negotiations most often mentioned by urban full-time prosecutors. In examining actual plea bargaining cases, legal problems were found to be the operative reasons for negotiations. Tabular data and 10 references are provided. (Author abstract modified)