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21 Cards in this Set
- Front
- Back
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Define a system analysis |
A detailed study of the current system and requirements of the new system |
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What does a system analyst oversee |
Analysis-Find out what is needed Design- Designing the new system Development- Creating the system Testing- Making sure the system works Implementation- Integrating the system into a real life situation |
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Define a Feasibility Study |
A preliminary investigation carried out by a systems analyst to see whether a new computer system is necessary |
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Define the features of a Feasibility Study |
.Requirements analysis- What the system needs to do .Technical report- Does the technology for the new program exist ? Will it take time to create ? .Schedule report- Can the new system be made in time frame ? .Cost Effective report- Would the returns of the program outweigh the costs to produce it ? .Budget report- Can the new system be created within an agreed budget ? |
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Define the methods used to analyze the current system |
.Questionnaires to staff and management- fast and questions must be simple .Interviews of staff and management- detailed and questions can be based of previous responses .Observation of procedures- shows system functioning and problems .Studying of documents- user manuals, Guidelines, papers and invoices |
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Define the design elements that need to be considered |
.Data- collected, stored, database design .Input- how is data input, validation .Processing- what type (batch/real-time), programs that are needed and what processing is taking place on the data .Output- screen designs for displaying output, printed report designs .Hardware- design, positioning and network configurations .Software- type installed and HCI type .Security- protection of system and data |
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Define what features a input form should have |
.Clear and uncluttered .Easy to understand .Appropriate language .Not large .Attractive .Help facilities |
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Define what features an output form should have |
.Concise .Title .Clear purpose .Organized |
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Define teamwork and its principles |
People working together and cooperating. .Listening .Sharing .Helping .Interacting .Respecting |
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Define an external entity |
Data source or Data destination (double square) |
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Define a process |
An operation performed on data (curved rectangle) |
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Define a data store |
Represent an type of storage for data |
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Define data flow |
Represents movement of data between entities, processes or data stores. Labelled showing what data is involved |
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Define direct change over |
Old system is discontinued entirely and new system taking over completely. Bad if errors persist in new system |
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Define parallel running |
Both old and new systems are run together with old system only discontinued after the new system is working properly, a lot of duplication work but no disasters if new system contains errors |
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Define piloting |
New system tried on a smaller sample of the entire company before releasing to entire workforce |
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Define phased change |
The new system is introduced in parts, prepossessing to the next new system part after the previous part runs successfully |
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Define the 3 types of Maintenance |
.Perfective-All systems can be improved .Adaptive- There may be changes in the company .Corrective- Fixing any problems that may arise which have not arisen until now |
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Define an interface |
A means in which to entities can interact with eachother |
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Define all types user interface |
.Command- A user has to type in a command .Menu- Options displayed in a hierarchy .GUI- Small icons are used to represent selections and these are clicked using a mouse .Speech recognition- Microphones used to to capture input commands, sound is analysed and computer carries out the appropriate task .Handwriting recognition- Used with small computers where keyboards are impractical .Hypertext- Hyperlinks are used to navigate from one page to another, useful for users with low level IT skills |
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Define types of documentation |
.Technical manual- System specifications, algorithm specifications .User manual- Software installation steps, program booting steps, setting up security steps, backup procedures, recovery procedures and how to enter data |
