All IT Courses 50% Off
QA Tutorials

AGE Testing

Age testing is a testing technique which evaluates a system’s ability to perform in the future and also carried out by test team. It tests, as the system gets older, how significantly it might drop in performance, is what is measured in Age Testing.

There are different types in Age 

  1. Defect Age- It is measured by two parameters
  1. Time
  2. Phases

Defect age steps will be defined as difference between defect injection phase and defect detection phase.


  • ‘Defect injection phase’ is the phase of software development life cycle when the defect was introduced.
  • ‘Defect detection phase’ is the software development life cycle whenever the defect is pinpointed.

The main formula is:

Defect Age in Phase = Defect detection phase – Defect injection Phase.

Defect Age –Time is defined as the time difference between defect detected date and also the current date,which is provided the defect will still be open.


  • Defects are in “open” and” Assigned” status and just in “New” status.
  • Defects are “closed” due to “non-reproducible” or “duplicate” are not considered.
  • Difference in days or may be hours is calculated from the defect open date and current date.

The formula is

Defect Age in Time = Defect Fix date or current Date – Defect Detection Date

Age testing is mainly done to check the performance of the system when it gets older. This testing is performed by the software testers. When there is any application or software product is being developed. Software testers perform a different type of testing in it to make sure that the developed application is working as expected and giving the desired results. Age testing is also part of the system or may be application which is working fine, as now, all the bugs which have been fixed. How it behaves in future? Here age testing is evaluated by the defect age.

For example:

Let’s consider if the user has brought any electronic product from the market in 2008 and if we check that same product in 2018 it will not perform in the same way exactly as it did in 2008, so the performance has been degraded with time. Age testing is being done to check how the application will respond in future.

Defect spoilage:

Defect spoilage means some factors due to which testers will find it difficult to detect the defect. These factors can be configuration, database connectivity and if the defect spoilage value is low, then the defect discovery process is not much effective. If a defect is found early stage, the cost involved in fixing the defect is less but the defect is found in later stage the cost involved is much.

Here the defect spoilage can be calculated by the sum of total number of defects multiplied by phase in which the defect is discovered and divided by a total number of defects found.

Defect Spoilage= (sum of total number of defects * defects discovered phase) / Total number of defects which are found.

Below diagram explains the defect spoilage. We have 5 defects in the design phase and out of which 2 are created in the requirement phase. Then the 6 defects are found in the unit testing phase, out of which none will be created in the requirement phase. Then we have 3 bugs which are fund in integration phase – out of which 1 is created in the requirement phase. So the total number of defects found are 5 + 6 + 3 = 14 and also sum of passed on defect multiplied by the factor is (2*1 + 4*1) = 6.

Defect spoilage =  6/14 = 0.428

This spoilage is calculated for all the rows and total spoilage is calculated

Defect Age

R-> Defect found in requirement phase

D-> Found in Design phase

Facebook Comments

Leave a Reply

Your email address will not be published. Required fields are marked *

This site uses Akismet to reduce spam. Learn how your comment data is processed.

Related Articles

Check Also
Back to top button

Get Python Course
worth 499$ for FREE!

Offer valid for 1st 20 seats only, Hurry up!!

You have successfully subscribed to the newsletter

There was an error while trying to send your request. Please try again.

H2kinfosys Blog will use the information you provide on this form to be in touch with you and to provide updates and marketing.