Decomposition is an analysis technique that breaks down a complex system, process, or problem into smaller and simpler components. It helps to identify the tasks, activities, functions, features, and requirements that are necessary to implement the deliverable. Decomposition also helps to organize, structure, and prioritize the components based on their dependencies and relationships. Organization, dependency, and interface are not analysis techniques, but rather aspects or results of decomposition . References: PMI Professional in Business Analysis (PMI-PBA)Examination Content Outline, page 10; Business Analysis for Practitioners: A Practice Guide, page 131-132

A fishbone diagram, also known as a cause-and-effect diagram or an Ishikawa diagram, is a tool that helps to identify and analyze the possible causes of a problem or an effect. It can help the business analyst to perform a root cause analysis in order to analyze and resolve the discrepancy identified through user acceptance testing. A fishbone diagram has a structure that resembles a fish skeleton, with a head, a spine, and several branches. The head represents the problem or the effect, the spine represents the main cause categories, and the branches represent the sub-causes or factors that contribute to the problem or the effect. By creating a fishbone diagram, the business analyst can brainstorm and organize the potential causes of the software flaw, and then investigate and verify the most likely root cause. A fishbone diagram can also help to communicate the findings and recommendations to the stakeholders and the development team. An interface analysis is a tool that helps to identify and describe the interactions and dependencies between different components or systems. It does not help to perform a root cause analysis in order to analyze and resolve the discrepancy identified through user acceptance testing, as it does not focus on the causes and effects of the problem. A Delphi estimation is a tool that helps to obtain a consensus among a group of experts on a complex or uncertain issue. It does not help to perform a root cause analysis in order to analyze and resolve the discrepancy identified through user acceptance testing, as it does not provide a systematic and structured way to identify and analyze the causes of the problem. A functional decomposition is a tool that helps to break down a complex system or process into smaller and simpler components or functions. It does not help to perform a root cause analysis in order to analyze and resolve the discrepancy identified through user acceptance testing, as it does not show the relationships and influences between the components or functions.
References: PMI Professional in Business Analysis (PMI-PBA)Examination Content Outline1, PMI Guide to Business Analysis2, Business Analysis for Practitioners: A Practice Guide3, Root Cause Analysis:
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The business analyst can determine the impact of a new requirement on existing requirements by reviewing the requirements traceability matrix. The requirements traceability matrix is a tool that tracks the relationships and dependencies among the requirements, as well as other project elements such as design, test cases, risks, or issues. By reviewing the requirements traceability matrix, the business analyst can identify which existing requirements are affected by the new requirement and assess the impact of the change on the scope, schedule, cost, or quality of the project. Performing a stakeholder analysis is not a way to determine the impact of a new requirement on existing requirements, as it focuses on identifying and understanding the needs, expectations, and influence of the stakeholders, not the requirements. Using time-boxing to defer the new requirement is not a way to determine the impact of a new requirement on existing requirements, as it postpones the analysis and implementation of the new requirement until a later iteration or phase of the project. Updating the use case documentation is not a way to determine the impact of a new requirement on existing requirements, as it only reflects how the new requirement affects one aspect of the solution functionality, not the entire project. References: Business Analysis for Practitioners: A Practice Guide 1, page 161-162; PMI Professional in Business Analysis (PMI-PBA)Examination Content Outline 2, page 19.

A test case is a set of conditions or variables under which a tester will determine whether a system under test satisfies the requirements or works correctly. A test case is derived from the requirements and the acceptance criteria, and it specifies the input data, expected output, and execution steps. A test case is incorrect if it does not match the requirements or the acceptance criteria, or if it contains errors, ambiguities, or inconsistencies.
If the business analyst receives a test result report that shows evidence of defective functionality, but verifies that the functionality behaves according to the requirements, the business analyst should first verify that the test case is incorrect. This can be done by reviewing the test case, comparing it with the requirements and the acceptance criteria, and identifying any discrepancies or flaws. By verifying that the test case is incorrect, the business analyst can avoid unnecessary changes to the requirements or the solution, and ensure that the test results are valid and reliable. References: PMI Professional in Business Analysis (PMI-PBA)Examination Content Outline3, page 21; Business Analysis for Practitioners: A Practice Guide4, page 101.

Competitive analysis is a technique to compare the strengths and weaknesses of similar products or services offered by competitors in the same market. Competitive analysis can help to identify opportunities, threats, and gaps in the market, and to develop strategies to increase sales and customer satisfaction. Competitive analysis can be used to identify solutions for the startup company that sells organic vegetable and fruit smoothies by comparing their best-selling juice with similar products offered by competitors. The other techniques are not suitable for this purpose. Benchmarking is a technique to compare the performance of a product, service, or process with a standard or best practice. Trend analysis is a technique to analyze historical data or patterns to forecast future outcomes or behaviors. Focus group is a technique to elicit opinions, preferences, or feedback from a representative group of customers or users. References: PMI-PBA Examination Content Outline, page 11; PMI-PBA Reference List, page 1, BABOK Guide v3, page 51.