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System Development Life Cycle Notes

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SYSTEM DEVELOPMENT LIFE CYCLE (SDLC)
IS of all types go through a predictable series of phases.
The following are the logical stages of the SDLC
a) Problem recognition.
b) Feasibility study.
c) Analysis.
d) Design.
e) System implementation
i. Coding / Construction
ii. Hardware Installation
iii. Testing
iv. File Conversion.
v. Documentation
vi. Changeover or Conversion to a new system
vii. Staff training & System Operation
f) System Review & Maintenance.
1. PROBLEM RECOGNITION
The birth of a new system occurs when managers or users realize
either that an IS is needed for a new business is no longer
reflective of the org functions e.g. as the business expand
considerably the IS could fail to offer functions that mgt think that
are important 4 future growth of the business.
Awareness of the inadequacy may come about as a result of a
formal review of the system or complains from the users if the
different btn both the business needs & what the IS can do are
sufficiently serious. Mgt may decide to call in a system analyst to
examine the problem in depth.
The major functions in this phase are to establish that a problem
exists.
The o/p of the phase Authorization to conduct feasibility
study.
Principle tools requiredNone
Personnel & tasks requiredA User or manager who notifies
an analyst that a problem exists.
2. FEASIBILITY STUDY
The purpose of a FS is to define the problem & to decide whether
or not a new system is viable.
During this stage, the system Analyst quickly studies the problem to
access its magnitude & at the time attempts to restricts the scope
of the project.
Since a change to one part of a system can quickly mushroom
throughout other areas of the company, its critical to decide
upfront exactly what will & will not be included in new project.
The Analyst lists precisely what is wrong with the current system as
well as what will be read of any new system for example, he/she
may indicate the current rib of records that the system is able to
maintain. He may also list a set of reports that the mgt may require
but are not available within the current system. The Analyst must
determine if the immediate system is technically, socially,
politically & economically feasible for the company.
N/B
Its impossible to deliver exact estimated in a FS since the system
has not fully specified & designed. After the estimates are
prepared the analyst must co-ordinate the cost & the benefit. CBA
is produced to evaluate the costs that the org will incur & the
benefits that the system will deliver. After mgt has examined CBA
it can choose either to abort the project bcoz it is not worth the
cost or to proceed to the analysis phase.
TYPES OF FEASIBILITY STUDY
Technical feasibility
Operational or Social feasibility
Economic feasibility
Political feasibility.
Schedule feasibility
Technical feasibility
An aspect of feasibility analysis that evaluates the technical
expertise, which the organization has in order to successfully,
implements the candidate system. The analyst also needs to access
whether the technology exists to implement the recommended
system.
Economic feasibility
Does the project make economic sense?
Benefits should outweigh the cost of the system.
Benefits of the system can either be tangle or intangible.
Cost of the system can either be tangible or intangible.

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SYSTEM DEVELOPMENT LIFE CYCLE (SDLC) IS of all types go through a predictable series of phases. The following are the logical stages of the SDLC a) Problem recognition. b) Feasibility study. c) Analysis. d) Design. e) System implementation i. Coding / Construction ii. Hardware Installation iii. Testing iv. File Conversion. v. Documentation vi. Changeover or Conversion to a new system vii. Staff training & System Operation f) System Review & Maintenance. 1. PROBLEM RECOGNITION The birth of a new system occurs when managers or users realize either that an IS is needed for a new business is no lo ...
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