system development life cycle
Terms in this set (15)
system development life cycle (SDLC)
SDLC is a sequence of activities, performed when a system is analysed, designed and implemented. SDLC is cyclic, this is because once systems been completed and is working it looks for imporvements that can be made to the system
what is a system?
a system is a way of doing things. Organgisations have different systems to deal with different areas. Systems to pay staff, purchasing stock, controlling stock and keeping accounts.
how to find information about existing systems
there are many ways information about existing systems can be found such as
-inspection of records
interviews with managers can reveal how their department works and the problems they have with the existing systems. They can give information about how they'd like the new system to work and what they think it should include
disadvantage of interviews
collection of information using interviewing is time consuming
observation involves sitting with a person and observing what they do in order to understand the information flows and processes they perform.
inspection of records
by examining documents they can understand what information is held.
documents giving general information would include
-organisation chards (chart showing the hierachy in the organisation and can be used to find out who reports to who)
-staff CVs- useful to assess the skills or training employees need
-job description- give details of the tasks undertaken by different people
-policy/ procedure manuals- useful to understand the way the organisation works
-previous system documents- paper documents when previous system have been produced
documents giving specific information would include
- picking lists
when compiling questionnaires the following should be borne in mind
- best not to ask for respondents name, risk of having unhonest answers
- structure the questions
- avoid leading questions
- at the end add the question 'is there anything i have missed that you think i should know about?'
feasibility and the feasibility report
feasibility will normally involve the following
- initial fact find which will give information on what is required from the project
- investigation into the technical, legal, economic, operational and schedule implications
- identifying the costs and benefits of the new system and weighing them against each other
-making recommendations as to feasibbility of the project
- a draft plan for the implementation of the project
a study carried out before a new ICT system is developed to see whether a new system can be developed at an acceptable cost to realise user benefit
analysis of existing system
analysis will normally involve:
- understanding the existing system
understand the proposed system if there is no existing system
-gathering and analysing different user requirements
- setting out the solution in a logical way using tools and techniques such as data flow diagrams, data models, process specifications and systems diagrams
- producing a specification
data flow diagram (DFD)
shows the flow, storage and processing of data in system
a diagram which represemys a susye, as a single DFD process
DFDs can be used:
-during system investigation to record findings
- during system design to illustrate how a proposed system will work
- when outlining the specifications of new systems
YOU MIGHT ALSO LIKE...
Test Preparation TOEIC, SAT, TOEFL
chapter 8 information systems lifecycle and project management
Ch 4 terms
THIS SET IS OFTEN IN FOLDERS WITH...
HIM 125 Final Exam
anatomy ch 7
Guide to HIPAA