Defects found during internal quality assurance process of software fixes supplied (IQADEF)

Defects found as "Failed Fixes in Production", i.e., software fixes which did not work as per requirement of original ticket (FADEF)

Regression Defects, i.e., software fixes which worked correctly as per original requirements of ticket but might have introduced another problems in application (REGDEF)

Total Failed Fixes are computed as follows: -

TOTDEF = IQADEF + FADEF + REGDEF

Therefore, Correct Fix % is calculated as follows: -

5. Residual Defects: One of the major critical success factors for support project is preventive and perfective steps taken by teams to stabilize their respective modules (rather than working in "corrective maintenance mode" where team supplies software fixes against raised tickets only). As part of preventive and perfective maintenance activities, teams identify relatively weaker areas of respective modules (on the basis of incidents and tickets reported by end-users) and plan additional regression testing / code refactoring on a continuous basis on their own. These activities help to stabilize applications faster and results are visible from the "residual defects" reported from the live application (i.e., declining trends of tickets). Residual Defects can be calculated as Tickets per unit size (Tickets per Function Point OR Tickets per KLOC). This parameter can be measured as: -

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* Contributed by: -
Ashish Gupta is an MCA graduate, currently working as a Lecturer at Lakshmi Narain College of Technology (LNCT), Indore.