There are various ways in which we can classify. Below are some of the classifications:
Severity Wise:
· Major: A defect, which will cause an observable product failure or departure from requirements.
· Minor: A defect that will not cause a failure in execution of the product.
· Fatal: A defect that will cause the system to crash or close abruptly or effect other applications.
Work Product Wise:
· SSD: A defect from System Study document
· FSD: A defect from Functional Specification document
· ADS: A defect from Architectural Design Document
· DDS: A defect from Detailed Design document
· Source Code: A defect from Source code
· Test Plan/ Test Cases: A defect from Test Plan/ Test Cases
· User Documentation: A defect from User manuals, Operating manuals
Type of Errors Wise:
· Comments: Inadequate/ incorrect/ misleading or missing comments in the source code
· Computational Error: Improper computation of the formulae / improper business validations in code.
· Data Error: Incorrect data population / update in database
· Database Error: Error in the database schema/Design
· Missing Design: Design features/approach missed/not documented in the design document and hence does not correspond to requirements
· Inadequate or sub optimal Design: Design features/approach needs additional inputs for it to be complete Design features described does not provide the best approach (optimal approach) towards the solution required
· In correct Design: Wrong or inaccurate Design
· Ambiguous Design: Design feature/approach is not clear to the reviewer. Also includes ambiguous use of words or unclear design features.
· Boundary Conditions Neglected: Boundary conditions not addressed/incorrect
· Interface Error: Internal or external to application interfacing error, Incorrect handling of passing parameters, Incorrect alignment, incorrect/misplaced fields/objects, un friendly window/screen positions
· Logic Error: Missing or Inadequate or irrelevant or ambiguous functionality in source code
· Message Error: Inadequate/ incorrect/ misleading or missing error messages in source code
· Navigation Error: Navigation not coded correctly in source code
· Performance Error: An error related to performance/optimality of the code
· Missing Requirements: Implicit/Explicit requirements are missed/not documented during requirement phase
· Inadequate Requirements: Requirement needs additional inputs for to be complete
· Incorrect Requirements: Wrong or inaccurate requirements
· Ambiguous Requirements: Requirement is not clear to the reviewer. Also includes ambiguous use of words – e.g. Like, such as, may be, could be, might etc.
· Sequencing / Timing Error: Error due to incorrect/missing consideration to timeouts and improper/missing sequencing in source code.
· Standards: Standards not followed like improper exception handling, use of E & D Formats and project related design/requirements/coding standards
· System Error: Hardware and Operating System related error, Memory leak
· Test Plan / Cases Error: Inadequate/ incorrect/ ambiguous or duplicate or missing - Test Plan/ Test Cases & Test Scripts, Incorrect/Incomplete test setup
· Typographical Error: Spelling / Grammar mistake in documents/source code
· Variable Declaration Error: Improper declaration / usage of variables, Type mismatch error in source code
Status Wise:
· Open
· Closed
· Deferred
· Cancelled
