CS101 - Introduction to Computing - Lecture Handout 20

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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.

Simple SW Life Cycle

What needs to be done

Detailed plan specifying

Decompose the problem

subsubsystems

Phase it out when the time comes

Concept & Feasibility

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