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System Development & Structured Methodology Notes

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System Development
Structured Methodology
In the late 70’s it was recognized traditional approaches had failed
& that there was need to have a suitable approach for solving
problems using computers.
It was necessary there4 to have new methods of analysis & design
that would offer the following:-
Clear specification of requirements by using graphical
representation as well as text coz a picture saves 1000 words.
There’s less scope for ambiguity & misunderstanding.
There’s greater focus on understanding & satisfying business
needs.
There’s more traceability in enabling a business requirement to
be followed from the initial analysis into the final technical
design.
There’s more flexibility in designing system that are not tied to
any specific hardware.
There’s more user involvement at all stages of the
development
There’s a distinction btn the processes & the data.
Advantages of Structured Methodology
There are clear stages with well know milestones, outcomes or
results (deliverables)
They adhere to accepted standards
The diagrams also enhance communication btn different
stakeholders.
The use of diagrams makes it easier for pple to understand as
opposed to large volume of text.
Disadvantages of Structured Methodology
System development process may take a long time coz of
the red tape.
There is a lot documentation that may at times be
cumbersome especially if it’s not well targeted to a
particular recipient.
SDLC
This is a systematic approach that we can use in identifying a given
user problem & providing an appropriate solution.
In this approach we take the problem & break it down into smaller
components where we move from the generalities (summaries) into
the specific details. This is also referred to as top down approach.
Bespoke Solution & off the shelves Solutions
Depending on the available resources an organization can choose
to go for a bespoke solution or an off the shelves solution.
In a bespoke solution an organization may approach a consulting
firm or a s/w house in order for them to develop a system on their
behalf.
Alternatively an organization can mobilize internal resources
(money), people & equipment in order to develop their own
solutions hence the use of the term tailor-made or custom
developed.
At times if circumstances are constrain, the organization may opt
for a ready made solution or opt the shelf solution that is available
& the implementation is shift.
Each of the 2 approaches has merits & demerits
Advantages of off- the-shelves solution
Portable
Developed by experts therefore well tested and are likely to be
free of errors.
Cheap coz they are produced in large scale therefore advantage
of economic scale.
Most application packages are well documented i.e. accompanied
by user manuals
User friendly- easy to operate.
Readily available tasks less time to implement them.
Disadvantages
Since they are not tailor-made, can’t solve unique problems of
users.
The user does not have the ownership right.
Require regular training especially every time a new package
version is introduced into the market.
Require regular maintenance and are subject to regular
obsolescence due to rapid development in software technology and
hence they become obsolete or out of date.

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System Development Structured Methodology In the late 70’s it was recognized traditional approaches had failed & that there was need to have a suitable approach for solving problems using computers. It was necessary there4 to have new methods of analysis & design that would offer the following:• Clear specification of requirements by using graphical representation as well as text coz a picture saves 1000 words. • There’s less scope for ambiguity & misunderstanding. • There’s greater focus on understanding & satisfying business needs. • There’s more traceability in enabling a bu ...
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