Systems Development Life Cycle - Design and Implementation
- Created by: lauren778
- Created on: 12-04-18 09:35
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- SDLC
- Design
- Drawing up detailed designs for every element of the new system
- HW Design
- Physical design of new devices that may be needed
- Eg. Bespoke data entry devices like scanners or specialised custom keyboards
- Physical design of new devices that may be needed
- Creating the Design Spec for SW
- Design of Output - reports such as invoices, payslips etc.
- Design of Input Methods - include design of forms
- Design of Processes - Queries, macros, calculations etc.
- Design of Data and File Structures - Allow a useable system to be built. Include the design of fields and table structure
- Design of Networks and Transmission Issues - include topology, type of cable, protocols etc
- Security Processes and Procedures - i.e.. registering with the Information Commission(er) and including where data is stored, access levels etc.
- Design of House Style & Ethos
- Implement (ation)
- What Happens During This?
- HW & SW is installed on site
- Staff are trained in the use of the new system
- Systems are then switched
- Changeover Strategies
- Direct Changeover
- Stop using the old system one day and start using the new system the next day
- Problems
- Risk - Particularly if the HW & SW are cutting edge
- If the system fails, then it can be disastrous to the business
- Advantages
- Requires fewer resources and is simple, provided nothing goes wrong
- Parallel Changeover
- Old ICT system is run alongside the new ICT system for period of time until all people involved with the new system are happy it is working correctly
- Advantages
- Used to minimise the risk in introducing new system
- Can compare results and be sure it is working properly
- Problems
- Lots of unnecessary work (duplication of effort) - expensive in time & equipment
- Direct Changeover
- What Happens During This?
- Design
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