Effect of Dialogs’ Arrangement on Accuracy and Workload for Confirming Input Data

Recently, a variety of web services are available through the Internet. On these web services, the users have to input data correctly such as personal information and ordering data on digital devices. If they make mistakes in their input data on this kind of services, it often makes serious troubles. To avoid these troubles, many services have functions like “confirmation dialog” for the users to confirm their input data. However, the traditional confirmation dialog can be skipped by simply clicking OK button on the dialog without confirming input data. To solve the problem, we proposed “Phantom Dialog” that shows simultaneously two parallel arranged dialogs with user’s input data and system-generated dummy data. It was found that the Phantom Dialog could make difficult to skip the process of the confirmation. But, it took longer confirmation time than the traditional confirmation dialog. In this paper, in order to reduce the time, we propose to increase the probability that user’s input data is shown on the left dialog, which is expected to be read firstly by the user on the Phantom Dialog. As the result of the evaluation with the three different probabilities on the Phantom Dialog, it is found that the participants can confirm their input data faster with left-biased probability without deterioration in the confirmation accuracy. Furthermore, most of them did not notice that the probabilities were different.