MAP-01-011 HFI Technical Guide - Human Factors Integration ...

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Annex 3 – HF Techniques, Methods and Tools• If all of the surveys are applied, the interface in question is subjected to avery exhaustive analysis.• Disadvantages• The application of the surveys is hugely time consuming.• It is questionable whether such dated survey techniques will be useful inthe analysis of synthetic or virtual environments.• An operational system is required for most of the techniques. The use ofsuch techniques during the design process would be impossible.• Whilst the surveys address the design inadequacies of the interface, noassessment of performance is given.A3.12.4User Satisfaction QuestionnairesA principal objective of the HMI designer is to maximise the degree of usersatisfaction, and therefore user acceptance, within a given user population. UserSatisfaction Questionnaires can be utilised to obtain the views of a range of HMIusers in a structured and consistent way.Satisfaction questionnaires typically address the more subjective, butnevertheless important, aspects of HMI design, such as comprehensibility ofinformation, perceived reliability, ease of use, level of difficulty and ease oflearning.The design of questions must utilise suitable terminology and phraseology.Assessments must be conducted using the real HMI or a high-fidelity real-timesimulation and must be conducted against a pre-determined set of tasks oroperational scenarios. Pre-determined rating scales are used and criteria mustdeveloped against which the need to ‘take action’ in cases of significant userdissatisfaction can be judged.The following three examples provide a précis description of three of the mostcommon type of User Satisfaction Questionnaires, highlighting the associatedadvantages and disadvantages of each tool.A3.12.4.1Questionnaire for User Interface Satisfaction (QUIS)The QUIS technique that has been developed to assess user satisfaction ofhuman-computer interfaces.The QUIS technique is used to elicit user opinions on all usability related aspectsof an interface, including ease of use, system capability, consistency andlearning. QUIS measures the user’s subjective rating of the human-computerinterface under analysis using a series of questions each with an associatedrating scale, typically ascending from 1 to 10.May 2006 Page A3-119 Issue 4
MAP-01-011 – HFI Technical Guide (STGP 11)• Advantages• QUIS is a very quick and easy technique to use, requiring almost notraining.• The output of QUIS is immediately useful, offering an insight into thesystem users’ attitudes regarding the usability of the interface underanalysis.• If the correct sample is used, the systems potential users are in effectrating the usability of the system.• Once an operational system is available, the speed, ease and usefulnessof QUIS allow it to be used again and again to evaluate and modify thedesign concept.• Encouraging reliability and validity statistics.• QUIS statements can be added and removed in order to make the analysismore suitable for the software system in question.• Can be used effectively even with small sample sizes.• Disadvantages• May require substantial development in order to be used to assess C4Isystems.A3.12.4.2Software Usability Measurement Inventory (SUMI)SUMI is a questionnaire technique that uses fifty attitude scale statements inorder to measure the usability of software systems. SUMI has designed to beapplied to any software system that has a display, a keyboard (or other dataentry device) and a peripheral memory device such as a disk drive and has beenused extensively used in the past for a number of different purposes:• Assessing new products during product evaluation.• Product comparisons.• To set targets for future application development.• To set verifiable goals for quality of use attainment.• To track achievement of targets during product development.• To highlight the good and bad points of interfaces.When using SUMI, the sample group are simply given a representative set oftasks to perform with the system under analysis and then are asked to completethe SUMI questionnaire.May 2006 Page A3-120 Issue 4
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