The audit has become, according to method of special engagements is, one of the modern techniques in auditing and performance evaluation of specific activities. Therefore checking productive plans and policies in economic units is very necessary to determine their compatibility with actual reality through performance evaluation which do it by an external auditor according to method of special engagement. Thus it should be given attention skills of auditors and their needs to training and advanced vocational education to adaptation with requirements of the modern auditing, such as checking productive plans and policies. The problem of research has represented inability of economic units to do planning job, implementation, auditing, putting the productive policies, and evaluation of their efficiency and effectiveness, from this point inability of economic units has become one of the basic responsibilities of an external auditor in special engagement that should be comport with international standards on auditing to evaluate productive plans and policies of economic units. The research aims to show contribution of performance evaluation of productive plans and policies to raise efficiency and effectiveness of economic units, preparing proposal model of external auditor report through dependence on method of special engagement. For purpose of testing hypotheses the research has depended on actual information of Wasit Company for Textile Industries that is followed to Ministry of Industry and Minerals to evaluate performance of productive plans and policies for years 2010, 2011, 2012. The researcher has reached to many conclusions one of the most important is audit method according to special engagement help administration to check it ability to achieve productive plans and policies through compare them with specific standards beforehand. Several recommendations were put according to the results that have been reached it.