Test Plans and Defects Tutorial Part 1

What are the categories of defects?

There are three main categories of defects:

  1. Wrong: The requirements have been implemented incorrectly. This defect is a variance from the given specification.
  2. Missing: There was a requirement given by the customer and it was not done. This is a variance from the specifications, an indication that a specification was not implemented, or a requirement of the customer was not noted properly.
  3. Extra: A requirement incorporated into the product that was not given by the end customer. This is always a variance from the specification, but may be an attribute desired by the user of the product. However, it is considered a defect because it’s a variance from the existing requirements.

What is Exploratory Testing and Specification-Driven Testing?

Exploratory Testing: means testing an application without a test plan and test script. In exploring testing test explore the application on the basis on his knowledge. The tester has no knowledge about the application previously. He explores the application like an end user and try to use it. While using the application his main motive is to find the bugs which are in the application.

Specification-Driven Testing: means to test the functionality of software according to the user requirements. In this, tester inputs multiple data and monitors the outputs from, the test object. In this testing tester evaluate the showstopper bugs which break the major functionality of the application. This type of testing requires test plan and test.

What is DRE?

To measure test effectiveness a powerful metric is used to measure test effectiveness known as DRE (Defect Removal Efficiency) .From this metric we would know how many bugs we have found from the set of test cases.

Formula for calculating DRE is

DRE = Number of bugs while testing  /(number of bugs while testing + number of bugs found by user).

Mobile Apps Testing Online Test Part 2

We have already covered various topics in QA Testing, now here you can take the Mobile Apps Testing Online Test for Free, with 12 questions. This Mobile Apps Testing mock test is prepared by experienced professionals on the basis of regular job interviews, so you can test your ability to meet the requirements in the present market.

This free online Mobie Apps Testing quiz will help you in your Skill Testing, and to prepare certification exams, as well as Job interviews.


1. You will be given 12 questions

2. It is recommended not to use the browser back button during the test.

3. Maximum Time limit: 25 Minutes.

4. At the end of test, click on ‘Review your results’ to view your Test Results

You must specify a text.
You must specify an email address.
You must specify a number.