Original sentence: Critics assert that a volunteer-based means of evaluation is not representative; certain respondents will be predisposed to participate or abstain.Military families' children are not included in the survey.Neither are children in remote locations; tracking, administering and accessing these children may be too difficult and costly.This alienates these groups from reform, since government policymakers are unaware of the trends and needs of these children
Edited sentence: Criticisms of the program are apparent when the details are known.Critics rally that a volunteer-based means of evaluation cannot possibly be fully representative, as certain types of respondents will already be predisposed to participate or abstain.For example, military children are not included in the survey, and neither are children who happen to live in more remote locations as tracking and administering or even just accessing these children may sometimes prove too difficult and costly.However, this has the effect of alienating these groups to possible reform and blinds government policymakers to the trends and needs of these children