Focusing on information quality (IQ) in information systems development (ISD), the analysis of language use forms the core of interest, as it is the venue for the system’s conceptualization process. On the one side, language unambiguousness is understood as an ideal basis for the success of ISD. In contrast, a fundamental postulation of language theories is the inherent ambiguity of natural language. Therefore, the analysis of how language consensus can be reached effectively is of particular interest for achieving IQ. We claim that the effectiveness of ISD depends on the ability to manage the question of how people deal with language in practice and reach consensus in the concrete ISD process. Hence, we analyzed the language interaction in an ISD project and identified different language interaction levels, which serve as orientation for specific interventions enabling an improvement of language use and language quality in the ISD process.