Accounts Billing Inventory Sales orders

Subsystems Subsystems Customers

1.4 Accounts

Receivable 1.1 Order Entry

1.3 Billing

1.2 Inventory

Sales orders Rejected sales order notices Accepted orders Payments by customers S ta te m en ts Invoices Billed orders Receivables ledger data Order log removals file Filled items Inventory ledger data Received items Purchasing data 3 3 2 2 7-26 Sales order edit rejects Order log Sales order credit rejects Customer credit file Customer

1.1.1 Edit

order data

1.1.2 Compute

credit check

1.1.3 Log in

orders

1.1.4 Mark

filled orders 1.2

1.3 Sales orders

Edit rejects Rejected sales order notices Edited orders Credit data Edited and checked orders Credit rejects Accepted orders Completed orders Date filled Order data 7-27 Multiple System Configurations Multiple System Configurations System Elements System Elements Alternatives Alternatives • CRT terminal CRT terminal • Hardcopy terminal Hardcopy terminal • OCR OCR Input Order log Customer credit file Rejected orders file Accepted orders file Completed orders file Rejected orders notice Processing • Magnetic tape Magnetic tape • DASD DASD • Magnetic tape Magnetic tape • DASD DASD • Magnetic tape Magnetic tape • DASD DASD • Magnetic tape Magnetic tape • DASD DASD • Magnetic tape Magnetic tape • DASD DASD • Printer Printer • CRT terminal CRT terminal • Hardcopy terminal Hardcopy terminal • Batch Batch • Online Online 7-28 Detailed Study Detailed Study Alternative Alternative Input Input Order Order Log Log Customer Customer Credit File Credit File Accepted Accepted Rejected Rejected Orders File Orders File Completed Completed Orders File Orders File Rejected Rejected Orders Orders Notice Notice 1 1 . . 2 2 . . 3 3 . . Scanner Scanner Keyboard Keyboard terminal terminal Magnetic Magnetic tape tape Keyboard Keyboard terminal terminal Magnetic Magnetic tape tape Magnetic Magnetic tape tape Magnetic Magnetic tape tape Magnetic Magnetic tape tape Magnetic Magnetic tape tape Magnetic Magnetic tape tape Magnetic Magnetic tape tape Magnetic Magnetic tape tape Magnetic Magnetic tape tape Magnetic Magnetic tape tape Magnetic Magnetic tape tape Printer Printer Printer Printer Hardcopy Hardcopy terminal terminal 7-29 Design Phase cont. Design Phase cont. 3. Evaluate configurations 3. Evaluate configurations 4. Select best configuration 4. Select best configuration 5. Prepare implementation proposal 5. Prepare implementation proposal 6. Approve or disapprove the system 6. Approve or disapprove the system implementation implementation 7-30

1. Executive summary 2. Introduction

3. Problem definition 4. System objectives and constraints 5. Performance criteria 6. System design

6.1 Summary description 6.2 Equipment configuration

7. The recommended implementation project 7.1 Tasks to be performed 7.2 Human resource requirements 7.3 Schedule of work 7.4 Estimated cost 8. Expected impact of the system 8.1 Impact on the firm’s organization structure 8.2 Impact on the firm’s operations 8.3 Impact on the firms resources

9. General implementation plan 10. Summary

Proposal Proposal 7-31