A business analyst needs to estimate the effort associated with project requirements.

Decomposition model is a technique that involves breaking down a complex entity into smaller and more manageable components. Decomposition model can help the business analyst to estimate the effort associated with project requirements by providing a hierarchical structure of the requirements, showing the dependencies and relationships among them, and allowing for more accurate and detailed estimation at lower levels. References: = PMI Professional in Business Analysis (PMI-PBA)® Examination Content Outline (2019), page 13; Business Analysis for Practitioners: A Practice Guide (2015), page 71.