Defect Analysis and TQM

HUMAN SIDEOF QUALITYKey Elements Of TQMCUSTOMER FOCUSPROCESSIMROVEMENT QUALITY

METRICS, MODELS,MEASUREMENT & ANALYSIS

Q vs qq reliability, availability, defectsQProduct, Process Quality, Customer satisfaction

Why Defect Analysis`Two approaches (views)Means of eliminating defects by inspection, proofs and testingSearch process flaw that permitted error (prevention)Better analysis of process defects

Defect Analysis & DetectionMost important for improvement of process

Eliminate defects from products delivered to internal and External customers.

How can u remove defects ?

Defect Detection & RemovalInspection techniques (design, Code ..)improve quality, reduce cost and scheduleAdd responsibility at individual level.Statistical Quality ControlApplication of statistical measures along the process key areaClean Room SWEError Prevention

Defect Detection & RemovalZero Defect SWWith in SDLC , each handoff has source and destination inspects the product against standards and req.Provide clear and definitive statement of the expectations via checklistTesting

Defect AnalysisBiggest threat Product is more important than ProcessTQM defect collections means: Have aclearly defined Objectives and goals for every onewell defined data gathering processdefined process for evaluation to improve development method (process)cover all process/productBe invisible and unobtrusive.

Goals and ObjectivesPrevention, detection, removalOR id of (definition of defect collection point)defect type/categorydefect injection pointdefect detection pointcost/schedule impact on product development cost/schedule impact to detect the defect method used for detection Process improvement through defect analysis

Defect Gathering & Analysis ProcessNot dependent on the SW development methodologyCrux: Document a procedure that is TQM process

1. Centralized DB for defects informationSet up method for creating Centralized DB of defects information (historical projects)Org ready for cultural changeThen procedure of recording and analysis is organizations responsibilityHistorical DB used to provide lessons learned from pastOrg NOT ready for cultural changeThen its very important and difficult. Need extra ordinary group of evaluators

2. Define data collection pointsAll ReviewsInspectionsTestsDeliveriesSchedule defect collection as other activityDefinition should include six element (slide 9)

Integration of data collection and schedule of process

Defect Categories and TypesDefect categoriesRequirements def defects, Design defects etcDefect typesDefinition of each type of defects ex TyposDefect detection pointRecord where defect was detectedDefect introduction pointWhen it was introduced

Defect Data AnalysisDefine defect gathering procedureId Defects in domain processPerform analysis of defect dataId areas requiring improvement (Pareto analysis)Id root cause (generally) Incomplete definition of requirement or processPoor communication of req /processInadequate training, process, toolIncorrect process or human errorId corrective action

Early detection in process domain is critical WHY?