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Goal Centric TraceabilityGoal-Centric Traceability: Using Virtual Plumblines to

Maintain Critical Systemic Qualities IEEE Transactionon Software Engineering. Sep/Oct 2008 Jane Cleland-Huang, Will Marrero, Brian Berenbach

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What is GCT?

The plumline Simple yet accurately

mesures compliance withgoal of having a vertical wallGoal Centric Traceability ismuch like this.

Mesures longterm compliencewith quality goals The ilities or Non functional

requirements

From wikipedia.orgPlumbob

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What is GCT continued

Different attributes represented are: Preformance

Reliablity Safty Security Usibility

Challanging to implement and maintaincorrectly over short and long term in largesoftware systems

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Quality Assessment Models

Stakeholder Goals Proactavly elicitatedTools explicitly used to measure andevaluate complience with requirementsRefered to the Quality Assessment Models inGCT

These often created and used in EarlyStages and then not reused durring latter revisions and maintinence

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Problems with this

This can lead to change induced systemfailure

Examples: Therac 25 New York City Subway Accident 1970

Japan Telecoomunications SwitchAlso leads to un-necessary rework... $$$

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Case Study

Ice Breaker SystemRobertson and Robertsons Mastering theRequirement Process

Charlotte and Greeley Co, Peel OntarioReceives series of inputs from a series of weather stations and forecasts freezingconditions to schedule salt dispersal

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Phases of GCTCreation

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Quality AssessmentMethods

Evaluate critical quality goalsTypes of models

Executable models i.e. preformancemodeling, fully automatedManually evaluated models i.e. checklistsfor process steps or coding features

Runtime monitors ensure that goalsrelated to safe/secure operation maintainedat runtime

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QAM cont.Test cases Critical for evaluating impact of a change if

goal is refined to the functional level.

I.e. security goal to limit access to authorizedusers can break down to functional level:users, roles, login, authentication

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Ice BreakerQAM

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Software MaintenanceStage

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Summery/Overview

The devil is in the details toorestrictive and it is too expensive/hard tomaintain, too permissive of change and

it is also a waste of moneyMust weigh criticality/cost benefit level, if the system is critical then is benificial

Must keep maintained and keep using

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Good points of paper

Good overview paper covering multiplesub methods and current applications of the methods in the real world

Good multi domain coverage paper covered de-iceing problem I coveredand a Nuclear Power plant

trainer/simulator

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Flaws

Process is an added cost and time tokeep upIntroductory paper, glosses over someof the issuesCase studies could cover more of a timespan show were developers able to

stick to the process