Implementation

Implementation Methods

Direct

This changeover is direct, it's is an instant swap from the old system to the new one.

Parallel

With a parallel changeover the organisation runs both the old and new system in parallel for a time. Once the organisation is sure that the new system is working properly and that staff are ready to begin using it they will make the decision to completely change over. During a quiet period, perhaps during the night or at a weekend, the data is fully transferred from the old system which is then shut down.

Phased

This is where the old system is still active but parts of the new system or modules are brought online, for example, perhaps just the data entry screens and the printing modules are made available but the 'back end' of the system remains the same. Once any problems are ironed out with the new modules then extra modules will be introduced. Effectively the installation happens in small chunks.

Pilot

This is where the complete new system is installed and tested in a small number of departments or branches. They then use the system and report their feedback and any issues to the analyst. Once the organisation is confident that the system is working as expected, it will be rolled out across the whole organisation.

Exam Question: Discuss which method would be best for a company looking to change over systems fast, the current system is losing them money. 

The best method that the company should use would be a direct changeover. This is because this method is fast and does not involve continued use of the old system which is losing the company money. Therefore using direct changeover will allow them to change to the new system immediately, which is an inexpensive process and by doing this the company will not be wasting money through the old system, this method will also allow the company to complete the changeover within a week as specified. 

Although direct changeover can be a risky process, because the new system may fail and there would be nothing to fall back on. As well as requiring a bit of human work as all data needs to be transferred, I think it is still the best method of changeover for the company, saving them both money and time. 

Discuss why a company would use parallel over phased implementation? 

With parallel 

Limitations of ICT

Limitation of modern technologies

1) Virtual Reality Headsets
- Designed with large amounts of wires etc. - takes away the realism and is a trip hazard.
- Limited field of view - low resolution - visually unconvincing: could mean the technology is not fit for purpose.
- natural effects are not present in the 'virtual reality world' - takes away the realism: means the technology may not be fit for all purposes, where a realistic environment needs to be created.
- Virtual Reality can make users feel sick due latency in motion tracking and cue conflicts in visual displays

To over come these limitations developments in improving the graphics and resolution will help to improve realism, helping to make the technology fit for purpose.

2) 3D Printing
- To slow to create products to be fit for purpose in the manufacturing process
- Can not make products simultaneously, meaning the 3D printer would not be cost effective or quick enough for mass production.
- Cost is high


Explain three limitations, for a candidate, of using a computer to answer exam questions. 
1. Computer may fail, fore example there could be a power outage and the computer would shut down whilst working, which may mean that work is lost and exam needs to be retaken.,

2. Answers may take longer to input if the user is not fast at typing, which means the user will have less time to answer the questions in the exam.

3. Their are health concerns/issues with using computer for a long period of time, such as RSI. ]

Describe three possible limitations to wireless networking for the wedding outfitter.
1. Additional hardware will need to be built, increasing installation costs.

2.