1.1.5 - Evaluate alternative installation processes. Flashcards
What is direct changeover in system conversion?
Direct changeover, also known as big bang or immediate, is the implementation of the new system with the immediate discontinuance of the old system.
What are the risks and costs associated with direct changeover?
It is very risky if the new system doesn’t function as expected but has low cost. Suitable for non-critical systems with appropriate training and procedures in place.
What is parallel running in system conversion?
Parallel running involves running both the old and new systems simultaneously for a short period to reduce risk and ensure protection from failure.
What are the benefits and drawbacks of parallel running?
Benefits include reduced risk and ability to revert to the old system if the new one fails. Drawbacks include high costs due to duplication of facilities and personnel.
What is pilot running in system conversion?
Pilot running involves implementing the new system in a specific section or region first, then expanding if successful. It localizes the risk of failure and allows problem rectification and training.
What are the advantages and disadvantages of pilot running?
Advantages include localized risk, problem rectification before wide distribution, and training opportunities. Disadvantages include a lengthy conversion period and potential feasibility issues.
What is phased running in system conversion?
Phased running involves converting the system one module at a time, with extended training periods and gradual implementation.
What are the benefits and drawbacks of phased running?
Benefits include minimized rate of change and gradual acquisition of data processing resources. Drawbacks include increased costs for temporary interfaces with old systems.
