What are models of object modeling?

Conceptual Models:

Conceptual models provide a high-level understanding of the system's purpose, scope, and major components. They are typically created during the early stages of systems development to establish a common understanding among stakeholders.

• Entity-Relationship Model (ERM): An ERM is a graphical representation of the entities, attributes, and relationships within an information system. It is used to identify and organize data elements and their relationships and to ensure that the data model is complete and consistent.
• Use Case Model: A use case model is a behavioral model that describes how the system will be used by different actors. It is used to capture the functional requirements of the system and to identify the interactions between the actors and the system.
• Domain Model: A domain model is a conceptual model that represents the key concepts and relationships within a specific domain or area of knowledge. It is used to capture the essential business rules and constraints that govern the behavior of the system.

Logical Models:

Logical models provide a more detailed representation of the system's structure and behavior. They are typically created after the conceptual models have been developed and are used to design the system's logical architecture.

• Class Model: A class model is a graphical representation of the classes, attributes, and methods within a system. It is used to define the structure and behavior of the objects in the system.
• Sequence Diagram: A sequence diagram is a graphical representation of the interactions between objects over time. It is used to capture the dynamic behavior of the system and to identify potential concurrency issues.
• State Machine Diagram: A state machine diagram is a graphical representation of the different states that an object can be in and the transitions between those states. It is used to capture the dynamic behavior of objects and to identify potential errors or inconsistencies.

Physical Models:

Physical models provide a detailed representation of the system's physical implementation. They are typically created after the logical models have been developed and are used to design the system's physical architecture.

• Database Schema: A database schema is a formal description of the structure of a database. It specifies the tables, columns, and relationships within the database and defines the data types and constraints for each column.
• Network Diagram: A network diagram is a graphical representation of the physical topology of a network. It is used to identify the devices and connections within the network and to plan for network expansion or upgrades.
• Hardware Architecture Diagram: A hardware architecture diagram is a graphical representation of the physical components of a computer system. It is used to identify the different components within the system, such as the processor, memory, storage, and input/output devices, and to show how they are connected.