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Differences Between Whitebox testing and Blackbox testing
 Question Submitted By :: Manual-Testing
I also faced this Question!!     Answer Posted By  
# 1
White Box Testing:Means testing the application with
coding /programming knowledge.That means the tester has to
correct the code also.

Black box testing:testing the application without
coding /programming knowledge that means the tester doesn't
require coding knowledge.Just he examines the appliaction
external fucntional beheaviour and GUI features.

byee friends
Is This Answer Correct ?    351 Yes 31 No
# 2
White box testing is done by the Developers. This requires
knowledge of the internal coding of the software.

Black box testing is done by the professional testing team.
This does not require knowledge of internal coding of the
application. Testing the application against the
functionality of the application with out the knowledge of
internal coding of the software.
Is This Answer Correct ?    218 Yes 41 No
# 3
Black box testing is done by any member of test team.because
you do not require any knowledge of coding which you
have to check only its functionality and GUI

In white box testing you need good knowledge of the coding is done only by developers
Is This Answer Correct ?    96 Yes 9 No
Jocky Garg
# 4
Whitebox Testing:It is done by developers.It typically
involves in coding.In this Testing developers concentrates
on internal structure of the program and justifgies whether
that program is correct or not.
Blackbox testing: It is done by seperate Testing team. in
this testers validates the developed application by
execution of testcases and finding Bugs and send error
Is This Answer Correct ?    101 Yes 25 No
# 5
(1)Generally black box testing will begin early in the
software development i.e. in requirement gathering
phase itself.
But for white box testing approach one has to wait for
the designing has to complete.

2)We can use black testing strategy almost any size either
it may be small or large.
But white box testing will be effective only for small
lines of codes or piece of codes.

3)In white box testing we can not test Performance of the
But in Black box testing we can do it.

4 )In general we have to write large quantity of test
cases for whitebox.
But in black box its a selcection of sample test cases.
Is This Answer Correct ?    89 Yes 28 No
Ravi Garg
# 6
In blackbox testing no knowledge of code is required and
with the little knowledge of the code thats called

Whitbox testing that is related to structual knowledge
whereas Blackbox Testing that is related to funtional
Is This Answer Correct ?    66 Yes 21 No
# 7
White box testing is nothing but coding.
It focus on the program part. Rather then finicality.
Black box testing is nothing but funcnality .
It focuses on the funcnality part rather then the program
Is This Answer Correct ?    65 Yes 31 No
Rajeshwar Rao
# 8
In Black Box testing, maintainability is hard, as when the User Interface constantly change the inputs also will have to change. In White Box Testing maintainability will be much easier than Black Box test as it deals with the underline codes, and a user Interface will not affect maintainability of the program. 
Is This Answer Correct ?    45 Yes 13 No
# 9
Black-box: This testing methodology looks at what are the
available inputs for an application and what the expected
outputs are that should result from each input. It is not
concerned with the inner workings of the application, the
process that the application undertakes to achieve a
particular output or any other internal aspect of the
application that may be involved in the transformation of an
input into an output. Most black-box testing tools employ
either coordinate based interaction with the applications
graphical user interface (GUI) or image recognition. An
example of a black-box system would be a search engine.
You enter text that you want to search for in the search
bar, press “Search” and results are returned to you. In such
a case, you do not know or see the specific process that is
being employed to obtain your search results, you simply
see that you provide an input – a search term – and you
receive an output – your search results.
White-box: This testing methodology looks under the
covers and into the subsystem of an application. Whereas
black-box testing concerns itself exclusively with the
and outputs of an application, white-box testing enables
you to see what is happening inside the application.
testing provides a degree of sophistication that is not
available with black-box testing as the tester is able to
to and interact with the objects that comprise an
rather than only having access to the user interface. An
example of a white-box system would be in-circuit testing
where someone is looking at the interconnections between
each component and verifying that each internal
connection is working properly. Another example from a
different field might be an auto-mechanic who looks at the
inner-workings of a car to ensure that all of the individual
parts are working correctly to ensure the car drives
The main difference between black-box and white-box
testing is the areas on which they choose to focus. In
simplest terms, black-box testing is focused on results. If
an action is taken and it produces the desired result then
the process that was actually used to achieve that outcome
is irrelevant. White-box testing, on the other hand, is
concerned with the details. It focuses on the internal
workings of a system and only when all avenues have
been tested and the sum of an application’s parts can be
shown to be contributing to the whole is testing complete.
Is This Answer Correct ?    4 Yes 2 No
# 10
WHITE BOX TESTING- In this the structural part of the
application is verified.
Role- developer

BLACK BOX TESTING- In this the functional part of the
application is verified.
Role- Tester
Is This Answer Correct ?    3 Yes 1 No
M.v.s. Prasad

Other Manual Testing Interview Questions
  Question Asked @ Answers
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How to write test cases using Use case diagrams 10.For a given condition (X>=0<100) how many test cases you can write ACCENTURE INTERVIEW QUESTIONS 1.what is BVA and ECP 2.Do we have recovery manger in Winrunner 3 how does the winrunner recognizes the project 4 how is winrunner is used in the project BLUESTAR INFOTECH INTERVIEW QUESTIONS What is the difference between Sleep and wait in winrunner what is integration testing and types of testing present what is system testing what is data driven testing what is functionality testing if requirements are given to you then how do you write the test cases for it Account number = Ok cancel For above given form the valid account number starts from 1 to 1000 so is it necessary to input the 1,2,3 ….998,999,1000 test cases to check the conditions of valid account numbers I,e is it compulsory to write 1000 test cases for the above form STAG SOFTWARE INTERVIEW QUESTIONS 1.what are the types of recording modes in winrunner 2.what are the three modes of running a test in winrunner 3.what is synchronization point 4.what are the contents present in a test case we need testing for the project 6.what is code review and code walk through At which phase the testing starts (begin) in the project How do we test Client server applications and a Web applications what is verification and validation what is adhoc testing what is traceability matrix what is base line document what is Test Life Cycle what is regression testing and retesting what is a BUG LIFE CYCLE what is a Bug what are defects what is functionality testing and system testing. a project has to be released in one day but the testing people got that project from the developers half of the day before so what they have to do to complete the testing process. 20 what are severity level and priority levels AZTEC SOFTWARE INTERVIEW QUESTIONS 1. What is BVA and ECP 2. Which version of WINRUNNER and QTP you are using in the project 3. What is the use of Recovery manager in QTP 4. What is retesting and regression testing 5. Write the SQL queries for the following EMP table to select the employee id and his details from emp table 6. For example: employee dept and employee id and employee name and employee salary 7. what is a sub and what is a driver 8. What are your roles and responsibilities in your project 9. Does BVA is equivalent to ECP 10. If you find a bug what will you do MANHATTAN ASSOCIATES TESTING INTERVIEW QUESTIONS Choose the correct answer 1.Testing work starts once a)once requirements are complete b)once test cases are complete c)once coding is complete d)Beginning of the requirement 2.For White box testing ; A)The tester is completely unconcerned about the internal behaviour of the program B) the tester is concerned with finding the circumstances in which the program does not behave according to code standards C) Test data is derived from market requirements 3.stress testing is a measure of one of the following a) applilcation response time b) concurrent load on application can handle c) transaction per minute that can be handled d) virtual load at which the system will fail 4.Susan reviews a QA test plan prepared by her counterpart and gives her comments. It’s a part of a)Quality control b)Quality Assurance c)Both d)none 5.user acceptance testing means ; a)testing performed on a single stand alone module b)testing after changes have been made to ensure that no unwanted changes were introduced c)testing to ensure that system meets the needs of the organization and the end user 6.Software Quality Metrics will help you to A) Keep account on the software quality of an application B) Analyze and improve the deficiencies of the application C) Both of the above D) None of the above 7) Regression Testing: a) Tests how well the program runs with Adverse data b) Tests program input branches c) Selective retesting to verify modifications have not cause adverse effects d) Testing data during requirements phase 8)Application that has GUI must be tested for usability a) For any kind of UI applications b) More necessary for Web- based applications c) Only if the user is going to use the UI d) Only if the user pays for it 9) the program according requirements expects the uppercase letters from A to Z .analyse the following inputs and choose one that can cause the failure with greater probability. a) @, [ b) 1,0 c) B, W d) [,] 10)A system test that forces the software to fail in a variety of ways and verifies that software is able to continue execution without interruption. This definition is nearest to; a) Recovery testing b) Stress Testing c) Both of the above e) None of the above 11)Automated testing is necessary when a) testing has to be done very quickly b) number of resources are very less c) most of the test cases are similar in nature d) all of the above 12) which of the following tests is performed early in a software testing process a)Monkey testing b)Unit testing c)System testing d)None of the above 13)The testing technique that requires devising test cases to demonstrate that each program function is operational is called a) Black box testing b) Glass-box testing c) Grey-Box testing d) White-Box Testing 14) What UML diagram is useful for black box testing a) Class diagram b) Object diagram c) Use case diagram d) Sequence diagram 15) What kind of tools would you suggest to use the automation of regression tests a) Capture and play back b) Static analysis c) Simulators e) Debugging tools Basics of Winrunner 1. 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How to use the test director in your project What is use of recovery manager in QTP What are the add ins in QTP What are expressions in QTP if the developers are not convinced with your bug in this case what will you do if the developers are developing the application then what is the job assigned to the testers What is system testing What is smoke testing What is sanity testing What is sanitation testing   1
hi, How would you define the QA and QC? BirlaSoft 7
What is 3-Tier Architecture. How It will be implemented. Anybody can explain it in detail with easily understandable example. Thanks in advance.. Wipro 2
2. The prime benefit of testing is that it results in improved defects a. True b. False   4
Where will you give the Reproduce option in Bug report? GE 2
What is Usability testing?   7
Hi, Plz have a look on the following questions? Test Life Cycle, Regression,Performance, diff b/w system & integration, SDLC.. Virtusa 2
What's the difference between System testing and Performance testing? HP 4
do u know abt integration testing,how do u intregate diff modules? Cap-Gemini 8
If PRS is given to you on say XYZ functionality then which different types of testing you will perform . Please arrange these types in sequential manner in which you will perform? TCS 1
what is smoke testing? what is sanity testing?   5
What kind of inputs do we need from the end user to start proper testing?   1
For more Manual Testing Interview Questions Click Here 

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