Which IDEF focuses on both functional modeling and information flow?

IDEF0 is the correct choice because it is specifically designed to provide a graphical representation of the functions of a system and the relationships between these functions. This method not only emphasizes the activities and processes that occur within a system but also illustrates the information flow and the interactions between different elements of the system. By showing how inputs are transformed into outputs through various functions, IDEF0 enables stakeholders to understand both what the system does and how information moves through it.

In contrast, IDEF1X focuses primarily on data modeling, capturing the relationships and structures of data rather than the functional dynamics of the system. IDEF3 is more concerned with process modeling and the sequence of activities, placing less emphasis on how data flows through these processes. IDEF1, while concerned with information modeling, does not encompass the functional aspects as comprehensively as IDEF0 does. Therefore, IDEF0 is uniquely suited for addressing both functional modeling and information flow within a system.