Week 12 February 6, 2009

1.    What was the most difficult assessment item you completed in COIS20025 this term

Ans: – Both are not difficult for me. According to me, assessment item 2 was  little bit complex because it needs to change the Process model into correct data model and so much search was needed to get data related to comparison of data model and process model because both are modelling technique with only the difference of diagrammatical representation.

2.   What was difficult about it and how would you suggest it could be improved?

Ans: – the difficult about it was that it needs so much search and depth understanding of both models. Data model can be improved only by clear understanding of identifying all attributes, entity and referenced data.

3.   Name three (3) things you learnt this term in COIS20025.

Ans: – in this term of COIS20025 course; I have learnt many things and get experience in designing phase of SDLC. The three things are:

(a)  I have learnt about system development life cycle.

(b) Learnt about social and ethical issues.

(c)  Learnt about designing process model of information system and data model used to implement database.

4.   What career are you working towards?

Ans: – I am working toward the career in system analysis or database administrator. In both roles, this course is helpful to create both information system and database system.

5.   How will you be able to use the knowledge and skills learnt in this course in your future career?

Ans:- I have gotten too much knowledge and skill like how to develop a system, how to enhance ,repair or modify the existing system by using which of maintenance type according to the need, what are the social ethical issues should kept in mind while developing system and what development cycle must used during developing information system. These are helpful in future career of system analysis or database administrator.

 

Week 10 February 6, 2009

Que:

Week 10

On pages 512 – 514 the textbook identifies and discusses four types of maintenance tasks. Post an entry to your blog that gives one example of each type of maintenance task that might be needed once BHSSRS (the system you have modelled and designed the data for in assignments 1 and 2) is in operation.

Ans:-

There are four types of maintenance tasks.

1. Corrective maintenance

2. Adaptive maintenance

3. Perfective maintenance

4. Preventive Maintenance

In this entry of blog, there is a discussion of each type of maintenance task that might be needed once BHSSRS is in operation.

1.  Corrective maintenance: – corrective maintenance refers to change made to repair defects in the design, coding or implementation without adding any functionality. If this maintenance task is used in Bowen High School Student Record System then there is a need to repair only. If we use this maintenance task in existing BHSSRS then there is a need to change or repair programs or repair or need to change format of stored data. Suppose there is problem in enrolment system of students. Then there is a need to repair the programming or design errors without adding extra functionality which cost less and more urgent than other.

2.  Adaptive maintenance: – it is technique to modify the system to environmental changes. These changes are being done because of change in business need or migrate to different operating environment. This adaptive maintenance in BHSSRS is used only when there is a change in business rules or migrate it to different operating environment. If this is slow system or there is a change in rules of BHSSRS then this type of maintenance will be opted by developer. But it is not needed by school because no business rules have been changed and no need to change its operating system.

3.  Perfective maintenance: - this maintenance will be opted if there is need to make extra addition, improves processing performance but not necessarily required. It is actually new development not really maintenance. Perfective maintenance is not so useful for Bowen High School because there is a need to change whole system rather minor development. But after development of Bowen high school student record system, if there is need to add something new features then it will be the best approach.

4.  Preventive maintenance: - it involves change made to a system to reduce the chance of future system failure. It is good approach if it implemented to BHSSRS to reduce or minimise future failure.

 

Adaptive , perfective, and preventive maintenance activities can lead to corrective maintenance activities if not carefully designed and implemented.