Thesis - Teknisk Design

o Time on taskINTERVIEW ON LEARNABILITYThe learnability interview is divided into three parts. These are the two tests right aftereach learnability block and the shared questionnaire. The two tests are composedby an adaption of the DALI test and the SAM.This adaption of DALI is a subjective workload test specially for haptic devices(Chin, E. et al. 2008; Pauzié, A. 2008). This method allows to compare the workload(including fatigue as an origin of the workload experienced by the driver) induces byseveral situations for an individual (approach of "human factors design", to definewhich condition is less costly for the user), and not to evaluate the capacity of anindividual according to the mean of a population (approach "tests in psychology") 4 .In this framework, at least 2 conditions must be set up(one reference and oneto be tested) and to apply the DALI at the end of each of them, then to comparethe results of the two contexts for the same person, with a turn over betweenparticipants (not always the same situation applied first) 4 .SAM is a pleasureness test (Desmet, 2002). With SAM three factors can betested: happiness of using the product, stimulation by using the product and controlover the product. These and the shared questionnaire can be consulted in theappendix II.4.5 Data acquisitionData acquisition was planned to measure the usability of the introduction of hapticfeedback for in car touch screens. To be able to measure usability we shouldmeasure its three components:EFFECTIVENESS:There is no need to look at effectiveness; all the participants were able to performthe actions and the quality was the desired.EFFICIENCY:Different performance measures would be taken in order to determine differentfacts. Also a subjective measurement on workload just after the each block of thetest will be performed by the participant to reassure the performance measures.Secondary activity performance measuresTime on taskAffects drivers’ visual behaviour?Eye trackingISO metrics number of glances and glance durationDriving performance is affected?Deviation of a normative path4 Annie Pauzié (Research Director, IFSTTAR/LESCOT).53