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ISO <strong>9126</strong> International Standard. However, manyresearches have focused on some weaknesses on thecurrent ISO <strong>9126</strong> and even on the draft versions of theupcoming new ISO 25000 series of standards (SQuaRE)[1, 2].The current version of the ISO <strong>9126</strong> consists ofinventories of proposed metrics to measure the qualityof the internal, external, and in-use software product.However, for each of these metrics there is a crossreferenceon where they could be applied (measured)during the ISO 12207 Software Life Cycle Processesand activities (SLCP). This paper provides a <strong>mapping</strong><strong>between</strong> these two standards to highlights theweaknesses of these cross-references and proposes away to address them.This paper is organized as follows: section 2 presentsan overview of the related software engineeringstandards, that is, ISO <strong>9126</strong> and ISO 12207. Section 3shows a detailed <strong>mapping</strong> of the ISO <strong>9126</strong> metrics towhere they could be measured during the Software LifeCycle Processes (SLCP) provided by ISO 12207.Section 4 discusses the results of this <strong>mapping</strong>. Finally,Section 5 concludes the paper with some comments andsuggestions.2. RELATED SOFTWAREENGINEERING ISO STANDARDS2.1 ISO <strong>9126</strong>The ISO <strong>9126</strong> series of standards now consists of oneInternational Standard [12] and three Technical Reports[16-18]:1. ISO <strong>9126</strong>-1: Quality Model [12].2. ISO TR <strong>9126</strong>-2: External Metrics [16].3. ISO TR <strong>9126</strong>-3: Internal Metrics [17].4. ISO TR <strong>9126</strong>-4: Quality in Use Metrics [18].The first document of the ISO <strong>9126</strong> series – QualityModel – contains two-parts quality model for softwareproduct quality [12]:1. Internal and external quality model.2. Quality in use model.The first part of the two-parts quality modeldetermines six characteristics in which they aresubdivided into twenty-seven subcharacteristics forinternal and external quality, as in Figure 1 [12]. Thesesubcharacteristics are a result of internal softwareattributes and are noticeable externally when thesoftware is used as a part of a computer system. Thesecond part of the two-part model indicates four qualityin use characteristics, as in Figure 2 [12].External and Internal Quality1. Functionality2. Reliability3. Usability4. Efficiency5. Maintainability6. Portability1.1 Suitability1.2 Accuracy1.3 Interoperability1.4 Security1.5 FunctionalityCompliance2.1 Maturity2.2 FaultTolerance2.3 Recoverabilit2.4 ReliabilityCompliance3.1 Understandability3.2 Learnability3.3 Operability3.4 Attractiveness3.5 UsabilityCompliance4.1 TimeBehavior4.2 ResourceUtilization4.3 EfficiencyCompliance5.1 Analyzability5.2 Changeability5.3 Stability5.4 Testability5.5 MaintainabilityCompliance6.1 Adaptability6.2 Installability6.3 Co-existence6.4 Replaceability6.5 PortabilityComplianceFigure 1: ISO <strong>9126</strong> Quality Model for External and Internal Quality (Characteristics and Subcharacteristics) [12].Quality in use1. Effectiveness 2. Productivity 3. Safety 4. SatisfactionFigure 2: ISO <strong>9126</strong> Quality Model for Quality in Use (characteristics) [12].The second, third, and fourth documents of the ISO<strong>9126</strong> series provide the following information [16]:1. Sets of metrics for each external quality subcharacteristic,internal quality subcharacteristic,and quality in usecharacteristic.2. Explanations of how to apply and use thesesets of metrics.3. Examples of how to apply these metricsduring the software product lifecycle.2.2 ISO 12207It consists of processes, activities for each process, andtasks for each activity [9, 13]. Figure 3 shows thesoftware life cycle processes, the number of activities ineach process, and the number of tasks in each process.The full list of the process, activities, and tasks can beseen in ISO 12207 and IEEE/EIA 12207 (the IEEE/EIA12207 is the IEEE version of the ISO 12207).
The ISO 12207 software life cycle processes aregrouped into three broad classes: primary; supporting;and organizational. Primary processes are the primemovers in the life cycle; they are acquisition, supply,development, operation, and maintenance. Supportingprocesses are documentation, configurationmanagement, quality assurance, joint review, audit,verification, validation, and problem resolution. Asupporting process supports another process inperforming a specialized function. Organizationalprocesses are management, infrastructure,improvement, and training. An organization mayemploy an organizational process to establish, control,and improve a life cycle process.Groups5.PrimaryProcesses6.SupportingProcesses7.OrganizationalProcessesProcesses5.1 Acquisition5.2 Supply5.3 Development5.4 Operation5.5 Maintenance6.1 Documentation6.2 Configuration Management6.3 Quality Assurance6.4 Verification6.5 Validation6.6 Joint Review6.7 Audit6.8 Problem Resolution7.1 Management7.2 Infrastructure7.3 Improvement7.4 TrainingNumber ofActivities5Number ofTasks237 2413 554 96 244 76 64 162 132 103 82 82 25 123 53 63 4Figure 3: ISO 12207 Software Life Cycle Processes, Activities, and Tasks.3. MAPPING BETWEEN ISO <strong>9126</strong>AND ISO 12207For each metric of the internal, external, and in-usemetrics, the ISO <strong>9126</strong> parts 2, 3, and 4 provides thefollowing information:• Metric name.• Purpose of the metric.• Method of application.• Measurement formula.• Interpretation of Measured value.• Metric scale type.• Measure type.• Input to measurement.• ISO 12207 SLCP Reference.• Target audience.Within the following subsections, detailed <strong>mapping</strong>s<strong>between</strong> the ISO <strong>9126</strong> quality metrics of the Internal,external, and in-use software product and the ISO12207 software life cycle processes and activities willbe provided. In more details, this <strong>mapping</strong> will focus onan investigation of the “ISO 12207 Software Life CycleProcesses (SLCP) References” provided by ISO <strong>9126</strong>for each of its metrics.3.1 INTERNAL QUALITY METRICSWithin the ISO <strong>9126</strong>-3 on software product internalquality metrics, there is 70 metrics. These metrics canbe applied during the software life cycle. Internalquality defined in ISO <strong>9126</strong>-1 as the totality ofcharacteristics of the software product from an internalview. Internal quality is measured and evaluated againstthe internal quality requirements. Details of softwareproduct quality can be improved during codeimplementation, reviewing and testing, but thefundamental nature of the software product qualityrepresented by internal quality remains unchangedunless redesigned [12].Figure 4 shows the number of internal qualitymetrics which can be applied (measured) during each of
Page 1: MAPPING BETWEEN ISO 9126</s
Page 5 and 6: efers to any type of intended users
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