WaterFall Model

WaterFall Model :

Waterfall approach was first Process Model to be introduced and followed widely in Software Engineering to ensure success of the project. In "The Waterfall" approach, the whole process of software development is divided into separate process phases. The phases in Waterfall model are: Requirement Specifications phase, Software Design, Implementation and Testing & Maintenance. All these phases are cascaded to each other so that second phase is started as and when defined set of goals are achieved for first phase and it is signed off, so the name "Waterfall Model". All the methods and processes undertaken in Waterfall Model are more visible

The stages of "The Waterfall Model" are:

Requirement Analysis & Definition:
All possible requirements of the system to be developed are captured in this phase. Requirements are set of functionalities and constraints that the end-user (who will be using the system) expects from the system. The requirements are gathered from the end-user by consultation, these requirements are analyzed for their validity and the possibility of incorporating the requirements in the system to be development is also studied. Finally, a Requirement Specification document is created which serves the purpose of guideline for the next phase of the model.

System & Software Design:
Before a starting for actual coding, it is highly important to understand what we are going to create and what it should look like? The requirement specifications from first phase are studied in this phase and system design is prepared. System Design helps in specifying hardware and system requirements and also helps in defining overall system architecture. The system design specifications serve as input for the next phase of the model.

Implementation & Unit Testing:
On receiving system design documents, the work is divided in modules/units and actual coding is started. The system is first developed in small programs called units, which are integrated in the next phase. Each unit is developed and tested for its functionality; this is referred to as Unit Testing. Unit testing mainly verifies if the modules/units meet their specifications.

Integration & System Testing:
As specified above, the system is first divided in units which are developed and tested for their functionalities. These units are integrated into a complete system during Integration phase and tested to check if all modules/units coordinate between each other and the system as a whole behaves as per the specifications. After successfully testing the software, it is delivered to the customer.

Operations & Maintenance:
This phase of "The Waterfall Model" is virtually never ending phase (Very long). Generally, problems with the system developed (which are not found during the development life cycle) come up after its practical use starts, so the issues related to the system are solved after deployment of the system. Not all the problems come in picture directly but they arise time to time and needs to be solved; hence this process is referred as Maintenance.

Resume tip ...

After referring a set of resumes for test engineer position. Following are few things that we really find un-appealing.
1. Open your resume in Word and search (Ctrl F) for words like "Involved", "Participated" etc. and delete the sentences containing them. The recruiter is not interested in what all are you were involved or participated - but he/she would like see "what you achieved" by doing that. Here is a way to rate your resume - Give one negative mark every time you encounter such word in your resume. How much did your resume score? Now do you understand why you are not getting enough interview calls?
2. I will not press very hard for this one - but if you do it is better. Get rid of words like "was Responsible for" or any variant of "Responsibility". What attracts recruiter is action word - "Achieved zero Downtime for systems I was responsible for" v/s "I was responsible for maintaining systems and ensure that downtime was low”. Notice the power of action. You will be delivering the same message but in a power packed way. That catches eyes of who "matter" in getting you a new "dream "Job. It is very important that you load your resume with these power packed action words, lots of them - especially in first 1-2 pages.
3. This one is the most "useless" part of resume if it is present. Writing paragraphs about the application that you tested with the names, versions, modules, detailed functionalities. Looks like a copy paste from functional specifications or SRS (System Requirement Specification) of the software product that tested. Watch out, some times this might land you in legal issues with your employer dragging you to court for leaking strategic product information to public - via your resume. This is big TURN OFF for the reader - especially a recruiter who would process and see thousands of resumes in a day.
Don’t forget the thumb rule – 1 page of resume for every 2 years of experience. So a person with 8-10 years of experience should not have a resume that exceeds 5 pages. Less and crisp is better and easier to read.
Enough? Open your resume and sanitize it TODAY.May God bless you with job offers and interview calls pouring all the way !!!
Update: 21 Nov 2007 -- I referred this post to someone and at the same time happened to read another related but useful post on the same topic ...
http://steve-yegge.blogspot.com/2007/09/ten-tips-for-slightly-less-awful-resume.html

Agile Testing

What is Re-Testing and Regression Testing?

Re-testing : Retesting means we testing only the certain part of an application again and not considering how it will effect in the other part or in the whole application.
Regression Testing :Testing the application after a change in a module or part of the application for testing that is the code change will affect rest of the application.

What is Test Bed?

Test Bed is an execution environment configured for software testing. It consists of specific hardware, network topology, Operating System, configuration of the product to be under test, system software and other applications. The Test Plan for a project should be developed from the test beds to be used.
Test Data is that run through a computer program to test the software. Test data can be used to test the compliance with effective controls in the software.