Thread: difference b/w bug duration and bug detection time?effectiveness and efficiency?

It's much harder and trickier to find and fix a bug in a live Testing as well Testing and debugging are important parts of development.

So to save time and make it easy we need to look at both the points: bug duration and bug time.

Bug duration: you need to check the history of the bug from which drop it lies and which thread it affects. So that testing can be done perfectly.

Bug Time: earlier and thorough detection and diagnosis of bugs. This leads to easier fixes.

Test Effectiveness = Loss due to problems / Total resources processed by the system
Test Effectiveness means, Effectiveness of testing to business

Test efficiency= (number of tests required / the number of system errors)

Metric shows the efficiency of tests in uncovering errors.

no For unplanned testing it's just R & D.

MTTF : Mean Time To Failure
MTTF = Total Execution Time/Num of Failures observed
total execution time is the executation time accumulated over all installations that run the sam eproduct. thus if one site has run the product for two months on two computers and another site has run the rpoduct for one month on one computer the total execution time is 2*2 +1*1 = 5months of execution time.
A simple example How it works:
MTTF = 40months /10 = 4months

thanks for that suhanip..

but can we calculate testing efficiency based on actuals when we perform unplanned testing?