One long standing limitation of survey research is the issue of respondent error.Until present there have been no research methods able to correct for this problem.In this study we present two approaches to correct for respondent error.In the first approach,we demonstrate how a valid instrument can be used,and the second approach requires two additional indicators.One is used to measure the response error and the second is used to correct for endogeneity.The second half of this study presents possible sources for valid indicators to correct for respondent error and make consistent estimation possible.