Should Business Analysts Model Requirements?

During a recent client visit I encouraged the use of modeling as a way to uncover hidden requirements and expectations. One of my clients expressed her rather strong opinion that modeling requirements was not and should not be a part of business analysis work. Oh, she could accept the fact that uncovering gaps between the “as-is” and “to-be” using process models made some sense, but she was adamant that this gap analysis should be done by a business Subject Matter Expert (SME), not by a business analyst (BA). As to data modeling, well that was technical in nature and if done at all, she said, it should be done by the technical IT staff. Use cases were helpful to the testing staff, but were clearly technical and were not to be done by BAs. Prototyping? This should be done by developers—no question about that one!