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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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Tags: System Development Structured Methodology Advantages of Structured Methodology Disadvantages of Structured Methodology Linear amp NonLinear Models