Conceptual designs of most information systems (IS) reflect a design/use dualism of technology making it difficult for users to be responsible for computerized aspects of work. The IS design theory (ISDT) for Dual Information Systems (DIS) helps bridge the design/use dualism. Its validity has not been studied empirically. This paper presents and applies a model that helps examine the validity of the ISDT. A domain-specific ISDT for Dual Change Management IS (DCMIS) is designed and applied to evaluate a change management IS (CMIS) in an organization responsible for managing a globally deployed enterprise resource planning system. The ISDT for DIS is found applicable for designing the ISDT for DCMIS, showing that IS theory development can be based on paradigms endogenous to the field. The ISDT for DCMIS can be utilized to solve problems in the use of the CMIS. It makes the ISDT for DIS increasingly tractable for practical applications.