Methods of Installing a new computer-based system.

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Presentation transcript:

Methods of Installing a new computer-based system

Coursework: details of appropriate, different, methods of changeover explained so that the client can make a reasoned decision. 2 marks: detailed consideration of different methods of changeover related to the system being installed 1 mark: basic consideration different methods of changeover

Learning Objectives: By the end of this topic you should be able to: describe a range of methods for installing a new computer-based information system discuss the choice of a particular installation method or methods for a range of applications

Installation Methods

Direct Changeover

Installation Methods Direct Changeover Parallel Changeover

Installation Methods Direct Changeover Parallel Changeover Phased Changeover

Installation Methods Direct Changeover Parallel Changeover Phased Changeover Pilot Changeover

Direct Changeover new system completely replaces the old without overlap Advantages: –changeover is swift no time wasted –only one system needs to be supported –minimum duplication of work –minimum disruption to the business Disadvantages –operations disrupted if the new system has errors –loss of confidence if things go wrong –staff stress/confidence/training.

Parallel Changeover old system continues alongside the new system –for a period of time Advantages: –new system can be checked against results from old system, –operations can continue while problems sorted out, –users can learn the new system at their own pace. Disadvantages –duplication of effort required to keep systems running, may put a strain on personnel.

Phased Changeover installation broken down into individual modules modules installed separately, at different times Advantages: –installation, training and costs can be spread over time –faults can be corrected with limited effect on the business Disadvantages: –time taken for full installation slow to commission the whole system

Pilot Changeover introduced to an area of the organisation for a given time. –maybe a department or branch –if system works correctly, it is activated at the next branch Advantages: results can be compared with the old system, bugs can be cleared from the system, –before full roll-out training can be modified in the light of experience. Disadvantages: complete roll-out can take some time

Coursework: details of appropriate, different, methods of changeover explained so that the client can make a reasoned decision. 2 marks: detailed consideration of different methods of changeover related to the system being installed 1 mark: basic consideration different methods of changeover