Process modeling is a technique that is used to define and document the business analysis approach. Process modeling involves creating a graphical representation of the business analysis activities, tasks, inputs, outputs, roles, and responsibilities. It helps to communicate and visualize the business analysis approach to the stakeholders, and to identify and manage the dependencies, risks, and issues. Process modeling can be done using various tools and notations, such as flowcharts, swimlane diagrams, BPMN, UML, etc12

Option A is incorrect because structured walkthrough is a technique that is used to validate and verify the business analysis approach, not to define and document it. Structured walkthrough involves presenting and reviewing the business analysis approach with the stakeholders, and soliciting their feedback and approval. It helps to ensure the quality, completeness, and alignment of the business analysis approach with the stakeholder needs and expectations34

Option B is incorrect because progressive elaboration is a technique that is used to refine and update the business analysis approach, not to define and document it. Progressive elaboration involves incrementally adding more details and clarity to the business analysis approach as more information becomes available. It helps to adapt the business analysis approach to the changing requirements, assumptions, and constraints of the project5

Option D is incorrect because decision analysis is a technique that is used to evaluate and select the business analysis approach, not to define and document it. Decision analysis involves comparing the costs, benefits, risks, and impacts of the alternative business analysis approaches, and choosing the one that best meets the project objectives and stakeholder preferences. It helps to justify and rationalize the business analysis approach to the stakeholders, and to document the decision criteria and rationale.References:

Business Analysis Techniques - ECBA, CCBA, CBAP Endorsed, Section 7.2: Process Modeling

Certification of Capability in Business Analysis (CCBA®) - Simplilearn, Module 5: Planning and Monitoring, Lesson 5.1: Plan Business Analysis Approach

Business Analysis Techniques - ECBA, CCBA, CBAP Endorsed, Section 7.3: Structured Walkthrough

Certification of Capability in Business Analysis (CCBA®) - Simplilearn, Module 5: Planning and Monitoring, Lesson 5.5: Validate Requirements

Business Analysis Body of Knowledge (BABOK® Guide), Section 5.1: Plan Business Analysis Approach, 5.1.3.2: Progressive Elaboration

[Certification of Capability in Business Analysis (CCBA®) - Simplilearn], Module 5: Planning and Monitoring, Lesson 5.2: Conduct Stakeholder Analysis

[Business Analysis Techniques - ECBA, CCBA, CBAP Endorsed], Section 8.6: Decision Analysis

[Certification of Capability in Business Analysis (CCBA®) - Simplilearn], Module 5: Planning and Monitoring, Lesson 5.6: Manage Business Analysis Performance