2.1.3 Changeover and Maintenance

Question 1

What is Changeover

Answer 1

When a digital system is no longer required or is no longer fit for purpose, an
organisation needs to carefully consider how it goes about implementing a new digital system to replace the old one.

Question 2

What are the 4 types of maintenance

Answer 2

Preventative

Corrective

Adaptive

Perfective

Question 3

Advantage of Parallel

Answer 3

If one fails, there is a backup.

Question 4

Disadvantage of parallel changeover

Answer 4

Duplication of effort so not something you
would want to do for a long time.

Question 5

Advantage of Phased changeover

Answer 5

Any problems with the new part deployed the rollout can be delayed until it is fixed.

Question 6

Disadvantage of Phased changeover

Answer 6

Requires the old system to work with the
new system.

Question 7

Advantage of Pilot

Answer 7

Only one branch is affected by any
problems

Question 8

Disadvantage of Pilot

Answer 8

Only works if branches are almost
identical, e.g. supermarkets or bank
branches

Question 9

Advantage of Direct changeover

Answer 9

The fastest way of changing systems from one to another

Question 10

Disadvantage of Direct

Answer 10

High risk if it fails as no turning back

Question 11

What is the need for maintenance after a product release

Answer 11

The company producing the technology will fix any problems for a period of time after the product has been released

The company will charge for every fix that is produced on an ad hoc basis rather than pay for a maintenance contract.

Where new functionality is concerned, the customer expects the company to provide free or paid updates.

Maintenance is rarely free; it is usually paid for even if that cost is rolled into the initial price

Question 12

Describe Adaptive maintenance

Answer 12

In adaptive maintenance, the production company fixes bugs and also adds extra functionality to the system.

Question 13

Describe preventive maintenance

Answer 13

Performing regularly scheduled maintenance activities to help prevent unexpected failures in the future.

Question 14

What is parallel running / changeover

Answer 14

With parallel running, the old system and the new system are ran along side each other for a period of time

Question 15

What is direct changeover

Answer 15

With direct changeover the old system stops getting used one day and the new system starts the next day

Question 16

What is pilot changeover

Answer 16

This involves in changing the systems for one part of the company and keeping the old system and slowly changing the old systems to new systems

Question 17

What is phased changeover

Answer 17

This involves where the new system is implemented one part at a time in phases

Question 18

Describe corrective maintenance

Answer 18

Fixes problems as they arise to ensure that the system closely matches the original specification.

Question 19

Describe perfective maintenance

Answer 19

Perfective maintenance is maintenance performed with the aim of making a perfect system i.e., one that completely matches the original specification with no problems at all.