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International KIET Journal of Software and Communication Technologies (IKJSCT)Volume 1, Issue 1, pp: 7-15, April 20133.Usability assessment standards and models:Literature reviewUsability measurement standards and modelsdefine some metrics or parameters to assess theUsability of a particular software application. Thereare various models proposed to assess theUsability. Here a review is provided of theseexisting models. This section will contain theirwork done and some of the limitations of thesemodels which gave the motivation to propose anew model. Some of these models are ISO9241,ISO/IEC9126, IEEE Std.610.12-1990, metrics forUsability standard in computing (MUSiC), qualityin use integrated measurement (QUIM).3.1 Traditional quality models addressing theUsabilityThere are various traditional quality models thataddress the Usability. These models are as follows:3.1.1 McCall [4]This is a hierarchical model which has 11 qualityfactors, 25 quality criteria and 41 quality metrics.This model has 4 criteria for Usability named asConstantine &Lockwood [8]Schneiderman[7]Nielsen [6]operability, training, communicativeness, I/O rate,I/O Volume.3.1.2 Boehm model [5]This model defines the Usability as the context towhich product is convenient and practical to use.Similar to McCall model this is also a hierarchicalmodel. It has total 19 quality factors includingproduct utility, portability and maintainability.Utility is further divided into reliability, Usabilityand efficiency. In this model unlike Mc Call modelit is not necessary that metrics are related to samefactors. These can vary according to circumstances.This causes uncertainty.3.1.3 Nielsen and Schneiderman model [6, 7]These models define the Usability through fivequality attributes. These five attributes of Usabilityare learnability, effectiveness, satisfaction, errortolerance and memorization. This model iscriticized by various graphics designer because itlacks in readability and typography.Different models have defined the Usabilitythrough different attributes. These are listed infollowing table1.Preece et al.[9]Shackel [10]Efficiency in useSpeed ofperformanceEfficiencyuseofThroughputEffectiveness(Speed)learnability Time to learn Learnability(Ease oflearning)Learnability(Ease oflearning)Learnability(Time tolearn)RememberabilityRetentionovertimeMemorabilityLearnability(Retention)Reliability in useUser satisfactionRate of errorsby usersSubjectivesatisfactionErrors/safety Throughput Effectiveness(Errors)Satisfaction Attitude AttitudeTable 1 — Usability attributes of various models3.2 ISO standards for Usability8 | P a g e