Activity Diagram is a visual representation of workflows and processes, illustrating the sequence of activities and decisions involved in a system or project. This skill encompasses the ability to create diagrams that depict the flow of control and data, enabling clear communication of complex processes. Activity Diagrams are used to analyze, design, and document processes, facilitating understanding among stakeholders and aiding in the identification of potential improvements or efficiencies.

Functional Requirement refers to a specification of the behavior and capabilities of a system or product, detailing what it must accomplish to meet user needs. This skill involves the identification, documentation, and analysis of requirements that guide the development process and ensure alignment with stakeholder expectations. Knowledge of Functional Requirement is used to create clear and measurable criteria for system functionality, facilitating effective communication among project teams and stakeholders throughout the project lifecycle.

Joint Application Design (JAD) refers to a collaborative approach used in the software development process that involves stakeholders, including users and developers, in structured workshops to gather requirements and design solutions. This skill facilitates effective communication and consensus-building among participants, ensuring that the final product aligns with user needs and expectations. Knowledge of Joint Application Design (JAD) is utilized to streamline the requirements gathering process, reduce misunderstandings, and enhance the overall quality of the software development lifecycle.

System Context Diagram refers to a visual representation that illustrates the boundaries of a system and its interactions with external entities, such as users, other systems, and external data sources. This skill encompasses the ability to identify and depict the relationships and data flows between the system and its environment, facilitating a clear understanding of the system's context. Knowledge of System Context Diagram is used to communicate system requirements, scope, and functionality to stakeholders, aiding in the analysis and design phases of system development.

User Guide refers to a comprehensive document designed to assist users in understanding and utilizing a product or service effectively. This skill involves the creation and organization of clear, instructional content that outlines features, functionalities, and troubleshooting tips. User guides are employed to enhance user experience, facilitate product engagement, and provide support for common questions or issues. The skill ensures that information is presented in a structured format that is accessible and easy to follow.