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Design , implementation and management of secured lan

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par Eliud Ir. Eliud Aganze
Jomokenyatta university of agriculture and technology - B.sc information technology 2014
  

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6.4.1.2 Direct changeover

The old system is stopped and the following day the new system is used. This could be disastrous if there are errors in the new system.

With this strategy, the changeover is done in one operation, completely replacing the old system in one go.  This usually takes place on a set date, often after a break in production or a holiday period so that time can be used to get the hardware and software for the new system installed without causing too much disruption.

Advantages:

i) The most rapid of all the strategies, provided it works.

ii) Less risk of confusion between old and new systems.

Disadvantages:

i) Most stressful for the users - the old system has gone so there is no going back if they have difficulties.

ii) Most difficult to train staff on as the new system was not in place to learn before the changeover.

iii) Most stressful for the developers - all the data and files from the old system will have to be converted ready for use on the new one.

iv) Most risky - if the new system does not work properly then there is nothing to fall back on.

6.4.1.3 Pilot running

The new system could be tried by part of the company such as one branch.

If all goes well, then the rest of the company can change to the new system

With this strategy, the new system replaces the old one in one operation but only on a small scale.  For example it might be tried out in one branch of the company or in one location.  If successful then the pilot is extended until it eventually replaces the old system completely.

Advantages:

i) Easy to control, the pilot can be halted at any time.

ii) Easy to evaluate because the new and old systems are both running.

iii) Low risk, if a small-scale pilot fails then not too much has been lost.

iv) Easy to train staff by letting them learn new skills on the pilot system.

Disadvantages:

i) It can be slow to get a pilot to completely replace the old system.

ii) A pilot may not show up problems that a full-scale implementation would. This is because a system can work well as a small-scale pilot but has difficulties when it is scaled up to a full operating system with more realistic volumes of data to be processed.

6.4.1.4 Phased changeover

With this strategy, the new system is brought in in stages (phases).  If each phase is successful then the next phase is started, eventually leading to the final phase when the new system fully replaces the old one.

Advantages:

i) Very structured, each phase can be fully evaluated before moving onto the next one.

ii) Lower risk, a well-planned and controlled introduction of the new system.

iii) Easy to train staff by letting them to learn new skills on each phase as it is introduced.

Disadvantages:

i) Slower than direct implementation.

ii) Although each phase is easy to evaluate, you have to wait until all the phases are complete before you can evaluate the whole change over.

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Bitcoin is a swarm of cyber hornets serving the goddess of wisdom, feeding on the fire of truth, exponentially growing ever smarter, faster, and stronger behind a wall of encrypted energy








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