Because of these practices, there is a certain selectivity that manifests itself in sororities, since maximum values are set for each organization. Women`s preference is becoming important and the criteria for selecting members must be implemented. From the number of mandatory policies in the unanimous information agreement manual, the membership recruitment and selection policy, which has been defined by the NCP, is a policy where that recruitment must be a "mutual choice and selection," including both the sorority chapter and the potential new member (PNM), the ability to limit the choice of membership , membership is finally submitted to the invitation of the National Panhellenic Conference , 2014a). The agreements were voted unanimously by the 26 chapters of the Member States; these policies have been specifically designed not to interfere with the sovereign rights of certain chapters. The NPC describes unanimity agreements as "principles, procedures and behavioural expectations considered so fundamental to an ethical and harmonious life that they are binding on each NPC member organization" (National Panhellenic Conference, 2015). The unanimous agreements focus on the structure of local governance based on the campuses of the NPC chapters, the operation of Alumnae associations, and many different strategies and practices related to member recruitment. An important goal in determining the size of sorority chapters on each campus is parity or justice among sororities on each campus (National Panhellenic Conference, 2014a). There are a number of mechanisms to support this objective, the first being to define "the whole," i.e. the maximum number of members that can be present in each sorority. Total adapts each year after the recruitment phase of primary membership (spring semester at F-M) each year to define the allowable chapter size (total size) of the campus.
Another practice is the setting of a "quota" during formal recruitment deadlines for membership. The quota is considered the maximum number of potential new members that each sorority can have after a formal recruitment period. It is important to note that with the admission of members through the formal recruitment process, it is possible to have membership above the total value, which is the only time it is acceptable for a chapter to have more members than the total allows. These mechanisms maintain relatively equal sororities, with the exception of some sororities that can fight to a point where these practices are no longer useful.