The purpose of this paper is to review the history, progress and results of one area of international standardization--the ergonomics of human-system interaction. It is a personal perspective based on my experiences as Chairman of ISO/TC159/SC4 over the past 17 years. The paper starts with some historical background and summarizes the main work of the Committee. It then identifies five areas wh...

Evaluation is a key activity in developing high level UX. This paper argues, however, that the early phases form the basis for UX, and evaluation should be seen only as a supportive role in ensuring UX. Four (4) main early activities are identified and their challenges briefly discussed. INTRODUCTION Good user experience (UX) and usability are key factors for successful products and systems. Fo...

Owing to the lack of human bandwidth online, feedback systems have been introduced as a means of providing information on quality. Existing studies on the effects of ratings systems have had conflicting results. With this in mind, this study investigates the relative contribution of information according to search cost. It focuses on Groupon, based on its unique provision of daily deals, most o...

We propose a fast penalized spline method for bivariate smoothing. Univariate Pspline smoothers Eilers and Marx (1996) are applied simultaneously along both coordinates. The new smoother has a sandwich form which suggested the name “sandwich smoother” to a referee. The sandwich smoother has a tensor product structure that simplifies an asymptotic analysis and it can be fast computed. We derive ...