The Systems Life Cycle: System Implementation (Cambridge (CIE) IGCSE ICT)

What is the system life cycle?

• The system life cycle is a structured process that guides the planning, creation, testing, and deployment of an information system

• Ensures systems are systematically developed, meeting needs of stakeholders, minimising risks and maximising efficiency

• The fourth stage is implementation, the purpose is to:

  • Deploy the system to the production environment and ensure all components work together in the live setting.

System Implementation

What is system implementation?

• System implementation is a process that happens after a system has been fully tested and is working correctly

• Implementation happens in two stages:

  • Data is transferred from old to new system

  • System changeover

• A changeover is moving from the old system to the new system

• A Changeover can occur in four different ways

  • Direct

  • Parallel

  • Pilot running

  • Phased

Direct changeover

• The old system is replaced by the new system immediately

• Used when quick implementation is necessary

Parallel running

• Both old and new systems run simultaneously for a period before the old system is phased out

• Used when a smooth transition with minimal risk is required

Pilot running

• The new system is implemented in a small, controlled environment before full-scale implementation

• Used when testing the new system in a real-world setting

Phased implementation

• The new system is implemented in stages, with each stage replacing a part of the old system

• Used when a gradual transition is preferred to minimise disruption