# Some Tricky Manual Testing Questions & Answers

Below mentioned interview questions will be very useful for the beginner, intermediate and experienced testers. These questions are quite tricky so we need to answer them carefully.

### Manual Testing Tricky Interview Questions

Following is the list of some questions and answers:

Q #1) Define the following along with Examples?

a. Boundary Value Analysis
b. Equivalence Testing
c. Error Guessing
d. Desk Checking
e. Control Flow Analysis

1.a) Boundary Value Analysis: A process of selecting test cases/data by identifying the boundaries that separate valid and invalid conditions. Tests are constructed to test the inside and outside edges of these boundaries.

In addition to the actual boundary points or a selection technique in which test data are chosen to lie along “boundaries” of the input domain [or output range] classes, data structures, procedure parameters, etc.

Choices often include maximum, minimum, and trivial values or parameters.

For Example – Input data 1 to 10 (boundary value)
Test input data 0, 1, 2 to 9, 10, 11

1.b) Equivalence Testing: The input domain of the system is partitioned into classes of representative values so that the no of test cases can be limited to one-per-class, which represents the minimum no. of test cases that must be executed.

For Example – valid data range: 1-10
Test set: 2; 5; 14

1.c) Error Guessing: Test data selection technique. The selection criterion is to pick values that seem likely to cause errors. Error guessing is based mostly upon experience, with some assistance from other techniques such as boundary value analysis.

Based on experience, the test designer guesses the types of errors that could occur in a particular type of software and designs test cases to uncover them.

For Example, if any type of resource is allocated dynamically, a good place to look for errors is in the de-allocation of resources.

Are all resources correctly deallocated, or are some lost as the software executes?

1.d) Desk Checking: Desk checking is conducted by the developer of the system or program. The process involves reviewing the complete product to ensure that it is structurally sound and that the standards and requirements have been met.

This is the most traditional means of analyzing a system or program.

1.e) Control Flow Analysis: It is based upon a graphical representation of the program process. In control flow analysis; the program graphs have nodes that represent a statement or segment possibly ending in an unresolved branch.

The graph illustrates the flow of program control from one segment to another as illustrated through branches.

The objective of control flow analysis is to determine the potential problems in logic branches that might result in a loop condition or improper processing.

We hope these questions will help you ace the Manual Testing interview.

### 14 thoughts on “Some Tricky Manual Testing Questions & Answers”

1. Hi Vijay,
Good question, can you add some interview questions?

Actually I want automation testing questions.

2. Hi ,
Vijay could u give some more explanation foreqivalance testing

• for equivalance class partioning the input has to be partioned into groups (valid and invalid)
ex:if customer needs userID field with only alphabets(A-Z) then valid data is A-Z and invalid data is a-z,special characters,blank spaces…

3. Hi Sandhya,
Could you please explain me how to solve questions regd. Coverage in ISTQB? Is there any trick for it?

4. Excellent topics coverd, I appreciate your knowledge. I suggest you if you give more typical examples for the above topics useful for viewres of this blog. Once again thanks for the above explanation.

5. hiii….i just done s/w testing course n m still confuse abt boundary value.I knw abt it bt m want tO knw simple thing that “what is boundary value”.plzzz give the definition

• Hi Akash,

In simple word Boundary values means its the both edge values. And here we don’t need to check all the input data instead only the boundary values we will check.
Lets say the valid inputs of a text field is 1-10.
Here for checking this we can divide the data into some equivalent partitions such as:
<1 i.e 0, 1-10, 11-99 etc.
Here the boundary values are 0,1,10,11,99 etc. So assumption is if these boundary values will pass then overall it will pass. And if any particular boundary vakue is failed means that particular range will fail.

6. Hi vijay,

In one of my interview I have been asked following question.

If we are testing web application on mobile, so from the functionality point of view is it necessary to test all functionality in each platform (iPhone, Android, BlackBerry etc.) separately? or testing on one platform is enough?

7. Hi ,
Vijay could u give some more explanation foreqivalance testing