How can you use context diagrams to define system boundaries?

1 What is a context diagram?

A context diagram is a graphical representation of a system and its environment. It shows the system as a circle or a rectangle, and the external entities that interact with it as squares or ovals. The interactions are depicted as arrows or lines, indicating the direction and nature of the data or information flow. A context diagram does not show the details of the system, such as its functions, processes, or components. It only shows the system boundary and the interfaces with the external entities.

2 Why use context diagrams?

Context diagrams can be a useful tool for stakeholders, such as users, customers, sponsors, developers, and testers, to gain a common understanding of the system and its scope. These diagrams can help identify the external entities that affect or are affected by the system, as well as define the high-level requirements of the system. Additionally, context diagrams can prevent scope creep by clearly defining what is in and out of the system boundary. Lastly, they provide a simple and visual format for communicating the system context and requirements to different audiences.

3 How to create a context diagram?

In order to create a context diagram, you must first identify the system and its purpose, as well as the external entities and their interactions with the system. Then, draw the system as a circle or rectangle in the center of the diagram and label it with the system name and purpose. Draw the external entities as squares or ovals around the system and label them with their names and roles. Additionally, draw the interactions as arrows or lines between the system and external entities, labeling them with data or information that flows along them. Finally, review and validate the context diagram with stakeholders to ensure accuracy, completeness, clarity, and consistency.

4 How to use context diagrams for requirement elicitation techniques?

Context diagrams can be used to support various requirement elicitation techniques, such as interviews, surveys, observation, and brainstorming. They can help you to define system boundaries and understand the system context and scope. Additionally, context diagrams can be used to guide your questions during interviews, design surveys and questionnaires, plan observation sessions, and facilitate brainstorming sessions. With context diagrams, you can capture and organize the outputs of the elicitation techniques as well as present and analyze the data. Ultimately, by relying on context diagrams you can improve your business analysis skills and deliver better solutions for your projects.

5 Here’s what else to consider

This is a space to share examples, stories, or insights that don’t fit into any of the previous sections. What else would you like to add?