ut suggesting how they are conducted. Logical models are also referred to as problem domain models. Examples of logical models include activity diagrams and use case diagrams. Logical models are constructed in the analysis phase while physical models are constructed in the design phase. In the design phase, logical models are refined into physical models, which provide information that is ultimately used to build the system. Logical models allow the analyst to focus on the business operations without getting distracted by the implementation details. Response: See pages 158-159