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COMP208/214/215/216 Lecture 4

COMP208/214/215/216 Lecture 4. Requirements Walk-through. Requirements Review Meeting. This meeting reviews the outputs of the first three steps of the method in Connolly and Begg. It will review the 7 items of documentation which should be produced in this phase of the project

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COMP208/214/215/216 Lecture 4

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  1. COMP208/214/215/216 Lecture 4 Requirements Walk-through

  2. Requirements Review Meeting • This meeting reviews the outputs of the first three steps of the method in Connolly and Begg. • It will review the 7 items of documentation which should be produced in this phase of the project • This review counts as 15% of your group mark.

  3. Organisation Details • The Requirement Specification Walkthroughs will take place in week 4 (between 20– 24 February 2012) • Teams are responsible for arranging a time for the review • Send e-mail to me, cc-ed to all group members • Make your booking by Friday 17 February. • The documentation to be reviewed must be submitted to the school office on or before 12 noon Friday 17 February • Reviews will typically last 20-30 minutes, well organised submission clearly written and fully complete will have an easier time at review

  4. Documentation Required • Mission statement • Mission objectives • System Boundary Diagram • User Views and Their Requirements • Transaction Requirements (if appropriate) • Systems Specification • Project Gantt Chart. • Descriptions and examples of items 1-6 are in • Connolly and Begg Chapters 3 and 4 (1st edition) or Chapter 6 (2nd edition).

  5. Format of the Review • For each deliverable: • A team member introduces the item • The reviewer may ask questions for clarification • Team replies to questions • The reviewer may make comments • Team may briefly respond to comments • A Report Form will be completed by the reviewer and given to the team as soon as possible.

  6. Mission Statement • The mission statement is a single sentence which defines the overall purpose of the database: what it is for • It should be clear and unambiguous • It is not a list of functions that the database will perform: it is the reasons why those functions are wanted. • StayHome example: p 64 of Connolly and Begg (p129 in 2nd edition).

  7. Mission Objectives • The Mission Objectives statement is a list of particular tasks that the system will support • Each objective begins with an infinitive • To maintain/ perform/ track/ find/ report/ show/ record etc. • Indicates which data items to be used • Tasks supported - not who will do them • Should be as comprehensive as possible. • Example: Figure 4.8 of Connolly and Begg (Figure 6.8 in 2nd edition).

  8. Systems Boundary Diagram • The intention of this diagram is to represent the main types of data relevant to the system • The boundary shows what will be included in the system and what will be not. Data may be: • In the system • Available on other systems to which links will be provided • Not to be available at all. • Figure 4.9 of Connolly and Begg provides an example (Figure 6.9 in 2nd edition).

  9. User Views and Requirements • Purpose: to identify the major classes of user and the functions they will use. • e.g. administrator, teacher, pupil: • Administrator maintains the database: views, adds, modifies, deletes records • Teacher customises the database: views and adds records, but doesn’t modify or delete records • Pupil uses the database: only views records. • In other applications, different users may maintain and use different data items.

  10. More on User Views • We are producing a list of users and, for each user, the functions they need: • Functions should relate to mission objectives: • Every user function should be included in mission objectives • Every mission objective should relate to some user function • Several users may use the same function. • Example at figure 4.10 of Connolly and Begg (Figure 6.10 in 2nd edition).

  11. Other roles • Developer account • Same as standard user but… • Allows for special test cases • E.g. credit card 1234123412341234 • (not LUHN tested) • System admin (different from admin) • Technical admin account • Allows backup and re-configuration

  12. Other issues • Logging • All transactions (cash or otherwise should be logged, i.e. stored in database table) • E.g. • log id,Userid , amount, description, payment id • 100, 1045, 100,”Purchase of book”,12 • Error logging • Store in error log on database all bug logs • Audit/security logging • Store in log, if when user gets password wrong, or wrong 3 times (you decide)

  13. System monitoring • How do you keep your system up • Checkout … Pingdom • What will you do if your payment server goes down…? • Backup services and fail over

  14. Connecting to external services • Payments • CC card • Paypal • Google • Email • Password forget • SMS • Reminders and password forget

  15. Transaction and Transactional Requirements • Each user view will involve certain transactions, stipulating how the data is to be used • There are three broad categories: • Data entry: every data item needs to be created somewhere • Data update and deletion • Data queries • Transactions should be related to the user view to ensure all functions are supported • Do transactions needed to be atomic

  16. System Requirements • Various aspects to cover here: • Initial Database Size • Rate of Growth • Expected type and frequency of searches • Network and Access requirements • Performance • Security • Back-up and Recovery • Legal Issues • Detail required will vary according to application and environment • e.g. a stand alone single user application will need less detail on access and requirements than a commercial multi-user system.

  17. Project Gantt Chart • A chart showing the major milestones, tasks and deliverables of the project and when they are scheduled • You need to report your past progress and future plans. • You will need to update this chart for each Walkthrough.

  18. Summary By FRIDAY 17 FEBRUARY 2012 • You must book your meeting. • You must supply the requirement documents During the week 20/02/12 - 24/02/12 • You must attend the review meeting • Please attend the meeting punctually • This review is an important milestone: it lays the foundations for the project.

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