October 2018
Intermediate to advanced
370 pages
9h 15m
English
We need testing because humans make mistakes. The software development life cycle includes several steps such as specifying requirements, design, development, and delivery. If a mistake occurs in one of these steps, it can lead to mistakes in further steps.
The following diagram shows how mistakes in different steps can impact on the whole process:

As you can see, it's important to detect a bug as soon as possible. There are many different types of testing that can be applied in different cases to recognize a defect as soon as possible.
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