s2 L25 Quiz - Data Flow Diagrams

What does a DFD External Entity represent?

• A person, organisation or outside system that sends or receives data from the system.
• The direction that data is moving between the external entities, processes and data stores.
• A file, form or database table that holds data for later use.
• An instruction or action that is being carried out producing an output.

What is a DFD Process?

• A file, form or database table that holds data for later use.
• A person, organisation or outside system that sends or receives data from the system.
• An instruction or action that is being carried out producing an output.
• The direction that data is moving between the external entities, processes and data stores.

What is a DFD Data Store?

• The direction that data is moving between the external entities, processes and data stores.
• A file, form or database table that holds data for later use.
• An instruction or action that is being carried out producing an output.
• A person, organisation or outside system that sends or receives data from the system.

What does a DFD Data Flow represent?

• A file, form or database table that holds data for later use.
• A person, organisation or outside system that sends or receives data from the system.
• An instruction or action that is being carried out producing an output.
• The direction that data is moving between the external entities, processes and data stores.

What is the purpose of a Level 0 Data Flow Diagram?

• To communicate directly with another external entity.
• To break down the system into individual processes, data stores, and data flows.
• To provide a detailed view of the overall system, including all processes and data stores.
• To give a high-level view of the overall system, showing simply what data is flowing in and out of the system.

What are the rules for data flowing into a data store in a DFD?

• It must go through a process (it cannot go directly to/from an external entity or other data store).
• It must go through a data flow (it cannot go directly to/from a process or external entity).
• It must go through an external entity (it cannot go directly to/from a process or other data store).
• It can go directly to/from an external entity or other data store.

What does a DFD represent?

• A file, form or database table that holds data for later use.
• A data flow diagram.
• A payroll system.

What is the purpose of a data flow diagram?

• To show the layout of a business
• To label objects with descriptions and numbers.
• To help design a system and show non-technical people how the system is going to function.
• To create a detailed view of a business plan

What must every process and data store have in a DFD?

• No inputs or outputs.
• At least two inputs and one output.
• At least one input and two outputs.
• At least one input and one output.

What are external entities in a DFD?

• A person, organisation or outside system.
• Files, forms, or database tables.
• The direction that data is moving.
• Instructions or actions that produce outputs.