In today’s scenarios there is hardly any business house which is not depending upon some software or the other for running its day to day affairs. Billions & Trillion of Dollars worth business transactions are being done every day using commercial software. Hence such businesses largely depending on software applications can get severely affected by the use of unreliable software operating under critical areas

Even human lives happen to be at stake if a software failure happens in Air Traffic Control or in Intensive care units in hospitals or in Nuclear Power Plants etc. Hence ensuring the reliability of the software applications by an effective & scientific testing is becoming a matter of prime importance.

A simple software application poorly coded shall have serious effect on the performance of the environment on the company like deterioration

The above V-Model describes four levels of testing. Each Level of testing provides adequate test coverage.


Although goal of each of these testing levels differ from each other a little bit, but ultimately goal of every level is aimed at ensuring the reliability of the overall project.

• Unit Testing is aimed to ensure that each and every line of code is tested.
  
• Integration Testing is aimed to ensure that all the components can be integrated and all the interfaces of every component are working correctly.
  
• System Testing is aimed to cover all the Paths / Scenarios possible during the use of the system. The system testing is performed in an environment which is similar to the production environment i.e. similar to the environment where the product will be finally deployed. Various types of System Testing are possible for testing various aspects of the software application.

• Acceptance Testing by the user
  

Effective Testing Process comprises of following steps:

• Defining Test Strategies and Planning.
  
• testing strategies to ensure that they remain aligned to the ultimate Project Goals
  
• Designing or Writing of Test Cases.
  
• Periodic Review of the Test Cases to ensure proper Test Coverage
  
• Execution of the Test Cases
  
• Capturing the Test Results
  
• Tracking the Defects
  
• Capturing the relevant Metrics
  
• Analyzing
  

By following the above-mentioned scientific steps for various levels of testing a reliable product can be expected to roll out.

It is common to find various Bugs / Defects even after the product is released to production. However an effective Testing Strategy and testing process helps to minimize these defects. A Testing Strategy and Testing Process is considered effective, if it minimize or eliminates these Design Defects or Coding Defects which are detected after introduction into the production.