chapter 10-mis
Terms
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- systems development is
- the process of creating and maintaining information systems
- systems development involves all five is components
- hardware, software, data, people, procedures
- why is systems deveopmet difficult and reisky?
- many projects never finished, some finishe but dont accomplish goals
- five major challenges to systems development
- difficulty of determining requirements, changes in requirements, difficulties involving scheduling and budgeting, changing technology, diseconomies of scale
- brookes law
- adding more people to a alte project makes the project later
- systems development life cycle SDLC
- the traditional process used to develop information systems.. systems definition, requirement analysis, component design, implementation, maintenace
- system definition is accomplished by prupose, goals, scope.
- dimentions of feasibility
- cost, schedule, technical, organizational
- all types of feasibility
- users role in reuirement phase
- review and approve requirements
- five components designed by
- hardware design, software deign, database design, procedure design, job descriptions
- iformation system is impltemented by
- system testing, test plan,user testing
- system conversion
- implies the process of converting business activity from the old system to the new
- pilot phased parallel plunge
- 4 conversions
- pilot
- implement entire system... limits exporsure to business if system fails
- phased
- system installed in phases, each piece installed and teste
- parallel
- complete new and old systems run together, safe, but expensice
- plunge
- high risk if new system fails, no fall bck system
- porblems with the SDLC
- waterfall- rarely works, causes team to go back and forth, raising costs and delaying project
- analysis paralysis
- projects spend so much time on documentation it hampers progress
- scheduling and budgeting difficultes
- time and cost estimates large project usually way off