Question

Draw a context and level 1 diagram for the following scenario. Your level 1 diagram must include

• external entities
• processes
• data flows
• data store


Scenario:

An Uber customer first makes a delivery request. This request is verified by accessing customer account details from the customer data store. The delivery details are then stored in a delivery data store and posted to the drivers and the restaurant. As soon as a driver and the restaurant send their confirmations, the system assigns the driver to the delivery, allowing the customer to track the driver's location and estimated arrival. Upon receiving the delivery, the customer marks the delivery as completed to initiate the processing of the payment. Payments are processed by accessing the customer's account details from the customer data store, accessing the driver's account details from the driver data store, accessing the restaurant's account details from the restaurant data store, and finally saving the payment details in a payment data store.

Answer 1

To depict the Uber Eats delivery system, a context diagram should represent the system with external entities (Customer, Driver, Restaurant) and the single data flow among them. The Level 1 Diagram should break down the system into detailed subprocesses and interactions, including request verification, delivery posting, driver assignment, and payment processing. It should feature external entities, processes, data flows, and data stores.

Step-by-step explanation:

Context Diagram and Level 1 Diagram

To illustrate the Uber Eats delivery system scenario, we will begin by sketching a context diagram which encapsulates the overall system and its interactions with the external environment. Then, we'll progress to the Level 1 Data Flow Diagram (DFD) which breaks down the system into more detailed subprocesses.

Context Diagram

In the context diagram, the Uber Eats system is represented as a single process (circle or square) with data flows (arrows) demonstrating the interactions between the system and the external entities: the customer, drivers, and the restaurant. External entities are depicted as rectangles, and data flows are labeled with the nature of the interaction or data.

Level 1 Diagram

The Level 1 DFD further decomposes the single process from the context diagram into multiple interconnected subprocesses. It should include the following elements:

• External Entities: Customer, Driver, Restaurant.
• Processes: Request Verification, Delivery Posting, Confirmation Handling, Driver Assignment, Payment Processing.
• Data Flows: Delivery Request, Account Details, Delivery Details, Confirmations, Location Tracking, Payment Details.
• Data Stores: Customer Data Store, Delivery Data Store, Driver Data Store, Restaurant Data Store, Payment Data Store.

Data stores represent where information is stored within the system, and arrows between processes and data stores illustrate the flow of information for storage or retrieval.