The paper analyses the degree to which subjects are able to report “accurately” the attitudes of their reference group or close discussion partners. Descriptive statistics confirmed that proxy and self-reports have a relatively low degree of congruence with regard to attitudes. Therefore, it remains unclear to what degree observed correlations between respondents’ own attitude reports and their reports on the perceived attitudes of relevant others are substantiated in social influence processes or simply result from egos’ projection their own attitudes on their alters. In this study the influence of ego’s access to information on the “quality” of the proxy-reports on attitudes towards immigrants in Germany is analyzed in the context of a broader understanding of the congruence of proxy-reports. For this purpose, we use two approaches to assess the “accuracy” of proxy-reports on attitudes applying different criteria of validity at an individual level. According to our results the accuracy of proxy-reports is conditional on characteristics of the dyadic relationships as well as the complete network these dyads are embededed in, a fact which seems to be have not yet been considered in previous research. In summary, it is recommended that for the collection of attitudinal data by using proxy-reports the name interpreter items should refer rather to general dispositions than to specific attitudes of alter.