What statement best describes the purpose of a dependency map in a financial model?

• A. It is optional and rarely used.
• B. It is unnecessary for small models.
• C. It is incompatible with iterative calculations.
• D. It is critical for transparency, auditing, and maintenance by clarifying dependencies.

Answer: (D)

A dependency map shows how inputs and assumptions flow through formulas to produce outputs, laying out the data lineage inside the model. In a financial model, this clarity is essential because it lets you see exactly which inputs drive each result and how a change in one assumption ripples through to multiple outputs. That visibility makes the model transparent to others, so audits, reviews, and explanations of how numbers were derived become straightforward. It also greatly aids maintenance: when an assumption is updated, you can quickly trace which outputs are affected and design targeted tests to verify the changes, reducing the chance of hidden errors. Collaboration and governance improve because everyone is working from a shared map of dependencies. The map is valuable even in small models, and it doesn’t interfere with iterative calculations; you can iterate while still having a clear view of how different parts of the model depend on each other.