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We introduce the Berlin Numeracy Test, a new psychometrically sound instrument that quickly assesses statistical numeracy and risk literacy. We present 21 studies (n=5336) showing robust psychometric discriminability across 15numerical questions about risk). The Berlin Numeracy Test was found to be the strongest predictor of comprehension of everyday risks(More)
The steering law is intended to predict the performance of cursor manipulations in user interfaces, but the law has been verified for only a few path shapes and should be verified for more if it is to be generalized. This study extends the steering law to paths with corners. Two experiments compare the movement times of negotiating paths with corners to(More)
Undergraduate computer science students have few opportunities to experience scientific investigation and computer science research. A human-computer interaction (HCI) course can offer many opportunities for research that are accessible to undergraduate students, and because of the similarity between the design and research processes, a design project based(More)
We present detailed instructions for constructing and operating an optical trap using a hollow core fiber and two-laser beams. The trap is stable, confining 100-nm to 10-␮m particles of a variety of materials for hours of leisurely observation. The trap operates at room temperature and atmospheric pressure, costs less than $1400, and requires no machining.(More)
Experience working in multidisciplinary teams is important both to prepare Computer Science (CS) students for industry and to improve their communication with teammates from disciplines other than their own. This article describes the evolution and results of collaborations among three courses: an undergraduate CS course about user interface design and(More)
The JUnit Generation (JUG) system provides fast, semiautomated feedback to students. It uses a Java-like script to generate unit tests and time complexity tests, then runs those tests to generate reports. The goals for JUG are improved feedback for students, and decreased preparation and grading time for instructors and grading assistants.
We developed combined graduate and undergraduate courses in which undergraduates created a prototype based on user-centered design, and graduate students worked with them to evaluate those prototypes based on common usability principles. It provided undergraduate students experience practicing user centered design, while providing graduate students(More)
In this paper we present YAUIM - yet another user input method. YAUIM is an alternative user input mechanism to the conventional keyboard, mouse, and touch screen inputs. It utilizes the embedded accelerometer to detect device movements and tilt positions to enable user inputs. Accelerometers embedded in devices have been used to identify meaningful(More)
Remote navigation, popular in computer games and prevalent in areas such as clinical medicine and teleoperations of robots and drones, uses human-computer interfaces for control. Usability studies of remote navigation interfaces require good metrics for evaluating interfaces, assessing users' capabilities, and determining the difficulty of the navigational(More)