Directions ErgonomicsA/APerformance

Figure 1. MovExp is a versatile visualization tool which supports the HCI experts in evaluating user interfaces by means of data coming from motion capture and biomechanical simulation. In this example, HCI experts were interested in finding a input region on a vertical public display, where movements are accurate, fast and least fatiguing. The screenshot on the right shows the analysis in our tool MovExp. The circular directions visualization was used to brush horizontal movements, and movements with high throughput and low muscle activation were selected on a scatter plot. These two selections were combined using an and operator. Note how data is visualized on top of a photo of the public display, showing its spatial setup. We call this a case-specific visualization. The Ergonomics aspect of the data is visualized using a muscle view. The optimal region was identified to be in the middle of the display. Abstract—In Human-Computer Interaction (HCI), experts seek to evaluate and compare the performance and ergonomics of user interfaces. Recently, a novel cost-efficient method for estimating physical ergonomics and performance has been introduced to HCI. It is based on optical motion capture and biomechanical simulation. It provides a rich source for analyzing human movements summarized in a multidimensional data set. Existing visualization tools do not sufficiently support the HCI experts in analyzing this data. We identified two shortcomings. First, appropriate visual encodings are missing particularly for the biomechanical aspects of the data. Second, the physical setup of the user interface cannot be incorporated explicitly into existing tools. We present MovExp, a versatile visualization tool that supports the evaluation of user interfaces. In particular, it can be easily adapted by the HCI experts to include the physical setup that is being evaluated, and visualize the data on top of it. Furthermore, it provide