a-Identify the processes, external entities, data storeDraw

b-Context level DFD ?

C-Draw Level 0 DFD?

Hammer hardware is an independent hardware store. The shop is owned by the manager who employed two members of staff.

Customers may purchase products and in some cases will be asked to give their personal details for warranty purposes. Customer may also make enquiries about products regarding availability, price etc.

Suppliers will provide invoice for such products and chase for payment where necessary. They will also be able to answer questions from the shop staff regarding products delivery dates and invoices etc.

The shop staff will also be responsible for checking incoming products against order form.

a:-

Step 1: Identify the processes

Add Customer Info

Product enquiry

Purchase product

Verify Product

Report Manager

Customer order

Create invoice

Print Invoice

Step 2: Identify the Entities

Manager

Staff

Customer

Supplier

Step 3: Identify the Data Stores

Customer Info

Staff Info

Product Info

Supplier info

b:- ?

C:- ?

Hammer Hardware Hammer hardware is an independent hardware store. The shop is owned by the manager who employed two members of staff. Customers may purchase products and in some cases will be asked to give their personal details for warranty purposes. Customer may also make enquiries about products regarding availability, price etc. Suppliers will provide invoice for such products and chase for payment where necessary. They will also be able to answer questions from the shop staff regarding products delivery dates and invoices etc. The shop staff will also be responsible for checking incoming products against order form. Solution Step 1: Identify the processes Add Customer info Product enquiry Purchase product Verity Product Report Manager Customer order Create invoice Print Invoice Step 2: Identify the Entities Manager Staff Customer Supplier Step 3: Identify the Data Stores Customer Info Staff Info Product Info Supplier info Department of Information Systems Identify the processes, external entities, data store Draw Context level DFD Draw Level O DFD