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The appropriate model type to assist the stakeholders in testing the performance and visual aspects of requirements 3 through 11 is a usability prototype. A usability prototype is a model that simulates the look and feel of the user interface of the solution, such as the layout, navigation, colors, fonts, and graphics. A usability prototype can help the stakeholders to evaluate the user experience, the ease of use, the accessibility, and the satisfaction of the solution. A usability prototype can also help to identify and resolve any usability issues or defects before the final implementation of the solution. References:

• CBAP / CCBA Certified Business Analysis Study Guide, 2nd Edition, Chapter 6: Requirements Analysis and Design Definition, Section 6.4: Model and Validate Requirements, p. 265-266
• A Guide to the Business Analysis Body of Knowledge® (BABOK® Guide), Version 3, Chapter 6: Requirements Analysis and Design Definition, Section 6.4: Model Requirements, p. 161-162
• A Guide to the Business Analysis Body of Knowledge® (BABOK® Guide), Version 3, Chapter 10: Solution Evaluation, Section 10.6: Validate Solution, p. 283-284

 A use case diagram is a technique that helps to depict the interactions between a system and its actors using graphical symbols and relationships. A use case diagram shows the actors that are involved in the system, the use cases that represent the functions or services that the system provides, and the associations that indicate how the actors and use cases are related. A use case diagram can be used with a state diagram to verify that all functions are defined to work with entity “User” for the different roles, as it can help to identify the use cases that correspond to the states and transitions of the entity, and to ensure that the use cases are complete, consistent, and accurate. A sequence diagram is a technique that helps to represent the sequence and timing of the messages that are exchanged between the objects or components of a system. A sequence diagram shows the objects or components that participate in the interaction, the messages that are sent and received by the objects or components, and the time order of the messages. A sequence diagram can help to illustrate the dynamic behavior and logic of the system, but it does not show the interactions between the system and its actors. A functional diagram is a technique that helps to represent the functions or processes that are performed by a system or a solution using graphical symbols and relationships. A functional diagram shows the functions or processes that are relevant to the domain, the inputs and outputs of each function or process, and the decomposition and hierarchy of the functions or processes. A functional diagram can help to define and analyze the functional requirements, but it does not show the interactions between the system and its actors. A data flow diagram is a technique that helps to create a high-level overview of a business process by showing the movement and transformation of data between entities and processes. A data flow diagram uses graphical symbols and arrows to represent the sources and destinations of data, the processes that manipulate data, the data stores that store data, and the data flows that transfer data. A data flow diagram can help to understand and document the data logic and structure of the business process, but it does not show the interactions between the system and its actors. References: BABOK Guide v3, Chapter 10: Techniques, Section 10.50: Use Case Diagram, p. 564-566; Section 10.49: Sequence Diagram, p. 562-563; Section 10.22: Functional Decomposition, p. 528-529; Section 10.18: Data Flow Diagrams, p. 522-524.

The BA should handle the change request by adding the feature to the product backlog for future prioritization. The product backlog is a list of features, functions, and requirements that are desired for the solution, but have not yet been planned or implemented. The product backlog is constantly updated and prioritized by the product owner, who represents the voice of the customer and the stakeholders. The BA should collaborate with the product owner to capture and document the change request and add it to the product backlog. The product owner will then decide when and how to prioritize the feature for the next iteration or release, based on the value and urgency of the feature and the feedback from the stakeholders. References:

• CBAP / CCBA Certified Business Analysis Study Guide, 2nd Edition, Chapter 3: Business Analysis Planning and Monitoring, Section 3.2: Plan Business Analysis Approach, p. 90-91
• A Guide to the Business Analysis Body of Knowledge® (BABOK® Guide), Version 3, Chapter 3: Business Analysis Planning and Monitoring, Section 3.2: Plan Business Analysis Approach, p. 58-59
• A Guide to the Business Analysis Body of Knowledge® (BABOK® Guide), Version 3, Chapter 4: Elicitation and Collaboration, Section 4.6: Communicate Business Analysis Information, p. 124-125

 Quantitative and qualitative data are two types of data that can help the end users evaluate the effectiveness of a solution. Quantitative data are numerical, measurable, and objective, such as cost, time, scope, quality, and customer satisfaction. Qualitative data are descriptive, subjective, and interpretive, such as feedback, opinions, perceptions, and experiences. By using both types of data, the end users can assess the solution from different perspectives and dimensions, and compare the results with the predefined success criteria for the initiative. References:

• Project Success Criteria Guide, Smartsheet
• 7 Project Success Criteria Examples, Indeed.com
• IIBA BABOK Guide, Section 5.4, Evaluate Solution Performance