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Related Content: CS101 - VU Lectures, Handouts, PPT Slides, Assignments, Quizzes, Papers & Books of Introduction to Computing
SW Development Methodology
We discussed the role of programming languages in computing
We also discussed the differences among low- & high-level, interpreted & compiled, and
structured & object-oriented programming languages
We also discussed the object-oriented and the structured methodologies for SW design
Any Other SW Design Methodologies?
Spaghetti Design Methodology
The most popular software design (programming) methodology
Today’s Lecture
Development process of reasonably complex SW systems does not consist of “coding” only
We will become familiar with the various phases of the process that developers follow to develop SW systems of reasonable complexity
SW Life-Cycle
The sequence of phases a SW goes through from the concept to decommissioning
It is important to think about all those phases before the design work starts
Thinking about the future phases generally results in:
Shorter delivery times
Reduced costs of development
A system of higher quality
A Case in Point
I didn’t discuss with the customer the specs of the HW & OS before developing a
particular e-commerce SW.
I wrote it for the HW/OS that was easily available to me.
Unfortunately that HW/OS combination differed from what was easily available to the
client Result: Huge amount of rework. Higher cost. Delayed delivery. Lower quality.
Therefore, now before designing a SW system, I first write down the installation manual,
and get it OK’d by the customer. I do the same with the Operation & Maintenance
manual as well.
Other Life-Cycle Models
The sequence of phases (or the life-cycle mode) that I showed is just one example of the
several sequences that SW developers follow
This one is called the “Waterfall” model
You will learn about some more models (e.g. the Spiral model) in your future courses
The Waterfall Lifecycle Model and its Derivatives
www.cs.qub.ac.uk/~J.Campbell/myweb/misd/node3.html
In Today’s Lecture
We became familiar with the various phases of the process that developers follow to
develop SW systems of reasonable complexity
We looked at a couple of problems related to the Waterfall SW development model
Next Lecture: 2nd In the Productivity SW Series Spreadsheets
We will become familiar with the basic features and functions of spreadsheets
We will become able to perform simple data analysis using spreadsheet SW