Implementation

Methods of implementation	Advantages	Disadvantage
Parallel Running	If the system didn’t work properly there is a backup system	It is a slow method of implementation
Direct Changeover	It is a quick method of implementation	There is no backup system
Phased Implementation	People can get used to the system	If the system didn’t work properly it is impossible to fall back to the old system
Pilot Running	If the system didn’t work properly, not all branches are affected	It is a slow method

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Evaluation

Documentation

Documentation is divided into two forms:

1. Technical documentation
2. User documentation

Technical documentation is produced specifically for the system analyst and the programmers. whether User documentation is provided to help the user with the new system.

Developing elements of technical documentation

Technical documentation consists of:

1. System documentation

It provides a detailed overview of the whole system

2. Program documentation

It is produced for those pieces of program code that have been written

Designing and developing elements of user documentation

User documentation is produced for several reasons, for example the user may not be familiar with the system so it will help him with various parts of the system until he becomes familiar. It is like tutorials.

It will include:

• Screenshots and descriptions on how he will use the software
• The purpose of the system
• The input and output format
• What to do when errors occurs
• A troubleshooting guide

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Development and testing

Design stage

This the second stage in system life cycle, it is designing the new system with the help of a programmer who is a person who writes the software.

He has to design:

·      The inputs to the system

·      The outputs from the system

·      The files and/ or database needed to store the data

·      The processing required to produce the outputs

·      Any validation checks that will be needed

·      The data needed to tell the system

System Analysis

System analysis involves examining the existing system in detail. The system analyst must find out why the system has to be changed, by:

1.  Collecting information on how the existing system works

2.  Establish the input, output and processing

3.  Recording information

4.  And finally, identifying the problem

The first stage in system analysis, the system analyst has to collect information about how the is the current system so he will use these four methods:

1.  Examining of documents

2.  Interviews

3.  Observation

4.  Questionnaires

After the system analyst has finished collecting the information he needs to identify the input, output and processing and quit often this stage is done whilst producing a data flow diagram.

The system analyst needs now to record all the results in order to establish all the relevant features of the existing system.

Data flow diagram is a graphical method of recording the inputs, outputs and processing that have been identified.

It consists of four components:

1.  Terminator

2.  Processes

3.  Flow arrows

4.  Stores

Data flow chart is a generally a method of designing a systems solution and so is not found very frequently in the analysis stage.

Now the system analyst can identify the problems in the old system. Since he used the system data flow chart, it helped him to identify the problems.

After the data flow diagram  have been produced they are examined together with the other results of analysis such as interview transcripts and questionnaire analysis to identify the problems with the current system.

References:

Tech-ict.com

Ict book (AS level and A level)