Why Testing is necessary ?

Why Testing is necessary ?

Software system have mistakes because

• Humans involved in software development are fallible
• Software development my involve bad assumptions resulting in mistakes

Software testing  tries to uncover as many mistakes as possible so that

• Customers and users shall not face problems because of existing bugs in software 
• Post release debugging is very expensive can be reduced  
• Stake holders get appropriate information to make decisions about software quality and release