What are the Quality attributes?

First in brief know what is Quality? Quality can be define in different manner. Quality definition may differ from person to person. But finally there should be some standards. So Quality can be defined as

  • Degree of excellence – Oxford dictionary
  • Fitness for purpose – Edward Deming
  • Best for the customer’s use and selling price – Feigenbaum
  • The totality of characteristics of an entity that bear on its ability to satisfy stated or implied needs – ISO

How a Product developer will define quality – The product which meets the customer requirements.
How Customer will define Quality – Required functionality is provided with user friendly manner.

These are some quality definitions from different perspective. Now lets see how can one measure some quality attributes of product or application.
Following factors are used to measure software development quality. Each attribute can be used to measure the product performance. These attributes can be used for Quality assurance as well as Quality control. Quality Assurance activities are oriented towards prevention of introduction of defects and Quality control activities are aimed at detecting defects in products and services.

Reliability
Measure if product is reliable enough to sustain in any condition. Should give consistently correct results.
Product reliability is measured in terms of working of project under different working environment and different conditions.

Maintainability
Different versions of the product should be easy to maintain. For development its should be easy to add code to existing system, should be easy to upgrade for new features and new technologies time to time. Maintenance should be cost effective and easy. System be easy to maintain and correcting defects or making a change in the software.

Usability
This can be measured in terms of ease of use. Application should be user friendly. Should
be easy to learn. Navigation should be simple.
The system must be:

  • Easy to use for input preparation, operation, and interpretation of output.
  • Provide consistent user interface standards or conventions with our other frequently used systems.
  • Easy for new or infrequent users to learn to use the system.

Portability
This can be measured in terms of Costing issues related to porting, Technical issues related to porting, Behavioral issues related to porting.

Correctness
Application should be correct in terms of its functionality, calculations used internally and the navigation should be correct. This means application should adhere to functional requirements.

Efficiency
To Major system quality attribute. Measured in terms of time required to complete any task given to the system. For example system should utilize processor capacity, disk space and memory efficiently. If system is using all the available resources then user will get degraded performance failing the system for efficiency. If system is not efficient then it can not be used in real time applications.

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Integrity or security
Integrity comes with security. System integrity or security should be sufficient to prevent unauthorized access to system functions, preventing information loss, ensure that the software is protected from virus infection, and protecting the privacy of data entered into the system.

Testability
System should be easy to test and find defects. If required should be easy to divide in different modules for testing.

Flexibility
Should be flexible enough to modify. Adaptable to other products with which it needs interaction. Should be easy to interface with other standard 3rd party components.

Reusability
Software reuse is a good cost efficient and time saving development way. Different code libraries classes should be generic enough to use easily in different application modules. Dividing application into different modules so that modules can be reused across the application.

Interoperability
Interoperability of one system to another should be easy for product to exchange data or services with other systems. Different system modules should work on different operating system platforms, different databases and protocols conditions.

Applying above quality attributes standards we can determine whether system meets the requirements of quality or not. As specified above all these attributes are applied on QA and QC process so that tester or customer also can find quality of application or system.



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17 comments ↓

#1 Thenmozhi on 08.31.07 at 5:40 am

A testing process that exercises a software system’s coexistence with others by taking multiple integrated systems that have passed system testing as input and tests their required interactions.

#2 Jacques on 02.14.08 at 2:18 pm

I think it is a good representation of quality but it is not complete. There is a total of 21 quality attributes structured in 6 major groups defined in ISO 9126.

#3 vijay on 03.06.08 at 12:36 pm

>>How Customer will define Quality – Required functionality is provided with user friendly manner.

@vijay,

required functionality with some extra features or some known issues from both ends. Is it ok? how about within time and budget?

vijaysavalagi@gmail.com

#4 Ketki on 04.28.08 at 4:25 am

Hi,
Can anybody pls help me with the points about the standards used in software testing. I have to give a presentation on standards used in software testing.Just wanted to know what should be the flow of the presentation?? What all points should i explain while presenting the topic

#5 srikanth on 05.06.08 at 9:02 am

mostly customer defines required functionalities. suppose if he receive extra functionalities they may be approved. here extra in the sense it depends on the functionality or easy navigation to the user. if the application really contains extra functionalities in terms of UI it is acceptable. and budget is no way concerned. i think

#6 VijayD on 05.06.08 at 10:23 am

Quality:
With respect to various products that we use in our day-to-day lives (Clothes, shoes, PC, car)
Quality: Meeting customer’s requirements/fitness for purpose
In terms of software services Quality means various aspects such as:
– Free from defects
– Within budget
– Within schedule

Regards,
VijayD

#7 sagar bandari on 07.01.08 at 4:07 am

software quality means measure how well software is designed and how well the software conforms to that design.
quality product: a product quality is a function of how much it changes the world for the better.(user satisfaction).

software product quality:
scalability(correctness), completeness, absence of bugs, fault tolerance, documentation.

#8 KAT22 on 07.10.08 at 6:28 am

Please explain the difference between quality and realibility.

Enjoy Testing
KAT22

#9 Vinayagamoorthy on 07.14.08 at 12:52 pm

Dear Vijay,

What are all the documents prepared in CMMi level5 company for Project and Test management?

#10 S Sarita on 10.13.08 at 1:29 pm

Hello KAT22,
I think Realibility is an attribute of Quality..

#11 siraj on 11.05.08 at 12:38 pm

a very good presentation, helping very much to understanding quality fundamentals

#12 Asawari on 11.17.08 at 12:08 pm

Hi all,

I am preapring for testing.Can anybody give me notes,sites or any good e-book ?.It will be very helpful to me.
my mail id is asawari_chavan@yahoo.co.in

#13 Vasantha on 05.28.09 at 8:02 pm

Hi, I would like to know what should be an approximate time duration that should go by, before I or the user could spot a bug in the newly released version? Based on reviews and testing processes, is there a norm for this or an approximate duration before which there should not be a bug reported, for the testing process to be considered as ‘good testing’?

#14 Suresh Babu on 06.02.09 at 9:40 am

Dear Vasantha,
There is no such kind of time constraints to report a bug in real IT scenario. You can report the bug at any time. If you are not confident about the functionality of the system you can discuss with your peers.

Thanks!!
Suresh

#15 Muhammad Ramzan Chaudhary on 04.19.10 at 11:39 am

Respected,
I am doing job as Software Tester with 1 year experience. The main issue is that we are not following any process. Just Ad hock testing. I am very worried as I have 1 year experience but have no grip on any process. can any one please guide me. on my email ramzan.danish@gmail.com
it will be great kindness.
thanks

#16 Vitalii on 10.24.12 at 11:34 am

I’ve heard it is Functionality, Maintainability, Reliability, Portability, Usability and Efficiency.

#17 Aamer on 06.04.13 at 6:54 am

pls i want to understand &simple study by report or e.book about quality control attributes in mechanical engg.
my e.mail:aamer1173@hotmail.com.
Aamer

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