Construction Of The Comprehensive Evaluation Model Of Mobile Phone Usability

In recent years,the usability have got more and more attention. With the popularity ofmobile phones,the requirement for mobile phone usability are increasing.But in the progress ofdevelopment，the human factors are always ignored by the company.For this reason，there aremany usability problems at different levels. Many early studies showed the limits for thesimplification of usability indicator.（1）Some studies measured only the subjective indicator；（2）Some studies measured only the objective indicator；（3）Some studies measured only theoutcome indicator in the subjective indicator.When comparing the difference between the twophones,for the separation of the subjective and objective indicators，which is hard to get theexact results.For this reason,we try to use a variety of methods in the study which measure theusability of mobile phones.We measure the mobile phone usability from the perspective of thephysiological load,and multipurpose use different types of objective indicators and subjectiveindicators to build a synthetic usability evaluation indicator system.Study1determine the dimensions of the indicator system，（1）Experiment1compile theusability questionare for the subjective indicator of mobile phones usability.We use223participants to test our draft usability questionare which is composed by72items.A total of40items finaly be established.(2) Experiment2control the task difficulty degree to clarify thevalidity of the EMG.We adopt40subjects to use the same mobile phone for the different task.The results reveal that there is significant difference between the simple task and the difficulttask.Study2build the synthetic usability evaluation indicator system model which is based onthe Backpropagation algorithm.（3）Experiment3acquire the multiple mobile phone usability indicator.The experiment mobile phones are Samsung Galaxy SII and HTC ONE S，two groupof subjects who test the experiment phones. After completing the task,we ask the subjects tocomplete the usability questionare.Results show here,HTC and Samsung have no significantdifferences on the scores of the usability questionare（t=-0,569.p=0.572）.For task1、8、12、14，there is significant differences between the twophones(t=-2.420*,p=0.020;t=-3.413**,p=0.001; t=2.538*,p=0.015; t=-3.338**,p=0.002).MF:（t=2.455，p=0.018；t=2.619，p=0.012；t=2.696，p=0.010；t=2.623，p=0.012；t=3.436，p=0.001；t=3.526，p=0.001；t=-2.220，p=0.031；t=7.397，p=0.000；t=9.077，p=0.000；t=5.945，p=0.000；t=4.694，p=0.000；t=8.481，p=0.279），Sumsung have betterperformance than HTC except task7.MPF：（t=4.450,p=0.000;t=6.021,p=0.000;t=2.942,p=0.005;t=6.099,p=0.000;t=3.187,p=0.003;t=8.475,p=0.000;t=4.335,p=0.000;t=5.046,p=0.000;t=7.303,p=0.000;t=4.070,p=0.000）Sumsung havebetter performance.(4)Experiment4bulid the evaluation model which have73%of the predictedrate.We use the Weights to comupute the usability scores which represent the usability of thetwo experiment phones.In this paper, a comprehensive evaluation of the multiple indictator of mobile phoneusability evaluation.The research overcomes the limitations of single indictator. And the modelestablished based on the algorithm, the output of the model are used in the comparison betweentwo phones effectively.