1. 7 Chapter 7 The University Lab: Conceptual Design Hachim Haddouti

2. 7 2 Hachim Haddouti and Rob & Coronel, Ch7 In this chapter, you will learn: how to conduct a database initial study. to identify and develop business rules for database design. to learn how to develop a conceptual database design. How to translate the business rules into ERD segments To develop an initial E-R model. How to put the ERD segments together to create the initial ERD

3. 7 3 Hachim Haddouti and Rob & Coronel, Ch7 Database Initial Study Checklist –Organizational Objectives Structure Operations Problems –System Objectives Scope and boundaries Information sources and users End-user requirements

4. 7 4 Hachim Haddouti and Rob & Coronel, Ch7 UCL Database Initial Study Users –Assistant Dean, College of Business –Computer Lab Director –Computer Lab Assistants –Computer Lab Secretary –Computer Lab Graduate Assistants Objectives –Provide users with controlled access to UCL assets –Guide users working with assets and provide problem-solving services

5. 7 5 Hachim Haddouti and Rob & Coronel, Ch7 UCL’s Organizational Structure

6. 7 6 Hachim Haddouti and Rob & Coronel, Ch7 UCL Description of Operations Inventory, storage, order management –Classifications: hardware, software, literature, supplies –Serialized vs. nonserialized items

7. 7 7 Hachim Haddouti and Rob & Coronel, Ch7 UCL Description of Operations (con’t.) Equipment maintenance and repair management –Information kept in Bad Equipment Log and Hardware Returned for Service Log Equipment check-out and check-in management –Form completed when equipment checked out –Notice sent for late equipment Lab assistant payroll management –Time sheets used to track assistants –Hourly basis for a fourteen day period Lab reservation management –Faculty member completes reservation form with date, time, department, and course number Computer lab access management –Lab users sign users’ log and leave University ID card

8. 7 8 Hachim Haddouti and Rob & Coronel, Ch7 Common Problems and Constraints in Current System Never up to date and error-ridden Too much data duplication and inconsistency Does not generate useful information Does not allow ad hoc queries CLD spends too much time processing data manually Lack of computerization makes inventory management difficult

9. 7 9 Hachim Haddouti and Rob & Coronel, Ch7 Specific Problems Inventory/Storage/Order Management –No access to crucial inventory management data for CLD –UCL needs available stock figures & average use of supplies –CLD does not know item location Equipment maintenance and repair management –CLD cannot generate history for equipment –CLD determine the status of items subject to maintenance procedures

10. 7 10 Hachim Haddouti and Rob & Coronel, Ch7 Specific Problems (con’t.) Equipment check-out/check-in management –CLD lacks information about lab assets Lab assistant payroll management –CLD spends too much time summarizing hours worked LAs –CLD cannot estimate work loads Lab reservations management –Manual reservation system inadequate –No statistical information for scheduling lab reservations Computer lab access management –User log not properly maintained –Certain items not returned –Security problems

11. 7 11 Hachim Haddouti and Rob & Coronel, Ch7 Constraints for UCL Time Frame –Operational within 3 months Hardware and Software –Use existing UCL hardware and software Distributed Aspects and Expandability –Operate in multiuser environment –Independent of existing administrative systems Cost –Development costs must be minimal –Use no more than two additional terminals –Operate without additional personnel –$9,500 is available

12. 7 12 Hachim Haddouti and Rob & Coronel, Ch7 System Objectives for UCL General System Objectives –Improve operational efficiency –Provide useful information for planning, control, and security Specific Objectives –Inventory/Storage/Order Management Better purchase order control Monitor supply item stock Control inventory by type and item Quick information about item location Timely information about use of supplies and generate stats to aid in future purchases

13. 7 13 Hachim Haddouti and Rob & Coronel, Ch7 Specific Objectives for UCL (con’t.) Equipment maintenance and repair management –Monitor maintenance histories –Track items returned to vendor Equipment check-out/check-in management –Tracks items checked out –Monitor item check-out time –Generate usage statistics Lab assistant payroll management –Scheduling and work loads –Work summaries

14. 7 14 Hachim Haddouti and Rob & Coronel, Ch7 Specific Objectives for UCL (con’t.) Lab reservations management –Decrease reservation processing time –Produce reservation schedules –Generate statistical summaries Computer lab access management –Control users and lab resources –Reduce sign-in time –Provide peak use information for scheduling

15. 7 15 Hachim Haddouti and Rob & Coronel, Ch7 Scope and Boundaries What will be system’s extent? –UCL portion of organizational chart –Independent of other systems What operational areas are covered by system? –Limited to six areas addressed earlier What design/ implementation strategy to use? –Organization into system modules What modules should be included in system? –Lab management –Inventory management How do modules interface? –Through CHECK_OUT module

16. 7 16 Hachim Haddouti and Rob & Coronel, Ch7 Modules and Interfaces

17. 7 17 Hachim Haddouti and Rob & Coronel, Ch7 Conceptual Design Phase Confirmation of good data sources

18. 7 18 Hachim Haddouti and Rob & Coronel, Ch7 Conceptual Design: General Systems Requirements Easy to use Provide security measures Fully integrated Able to access system concurrently Perform various functions –Personnel, inventory, order, maintenance, reservation, Check_out, and access Input driven by output

19. 7 19 Hachim Haddouti and Rob & Coronel, Ch7 Conceptual Design Phase: User Needs

20. 7 20 Hachim Haddouti and Rob & Coronel, Ch7 Conceptual Design Phase: Initial Entities

21. 7 21 Hachim Haddouti and Rob & Coronel, Ch7 Business Rule 1

22. 7 22 Hachim Haddouti and Rob & Coronel, Ch7 Business Rule 2

23. 7 23 Hachim Haddouti and Rob & Coronel, Ch7 Business Rule 3

24. 7 24 Hachim Haddouti and Rob & Coronel, Ch7 Business Rule 4

25. 7 25 Hachim Haddouti and Rob & Coronel, Ch7 Business Rule 5

26. 7 26 Hachim Haddouti and Rob & Coronel, Ch7 Business Rule 6

27. 7 27 Hachim Haddouti and Rob & Coronel, Ch7 Business Rule 7

28. 7 28 Hachim Haddouti and Rob & Coronel, Ch7 Business Rule 8

29. 7 29 Hachim Haddouti and Rob & Coronel, Ch7 Business Rule 9

30. 7 30 Hachim Haddouti and Rob & Coronel, Ch7 Business Rule 10

31. 7 31 Hachim Haddouti and Rob & Coronel, Ch7 Business Rule 11

32. 7 32 Hachim Haddouti and Rob & Coronel, Ch7 Business Rule 12

33. 7 33 Hachim Haddouti and Rob & Coronel, Ch7 Business Rule 13

34. 7 34 Hachim Haddouti and Rob & Coronel, Ch7 Business Rule 14

35. 7 35 Hachim Haddouti and Rob & Coronel, Ch7 Business Rule 15

36. 7 36 Hachim Haddouti and Rob & Coronel, Ch7 UCL Entities Considering Business Rules

37. 7 37 Hachim Haddouti and Rob & Coronel, Ch7 Initial ERD for UCL