Browsing by Author "Guimbretiere, Francois"
Now showing 1 - 4 of 4
Results Per Page
Sort Options
Item Accuracy, Target Reentry and Fitts' Law Performance of Preschool Children Using Mice(2003-06-04) Hourcade, Juan Pablo; Bederson, Benjamin B.; Druin, Allison; Guimbretiere, FrancoisSeveral experiments by psychologists and human factors researchers have shown that when young children execute pointing tasks, they perform at levels below older children and adults. However, these experiments were not conducted with the purpose of providing guidelines for the design of graphical user interfaces. To address this need, we conducted a study to gain a better understanding of 4 and 5 year-old children's use of mice. We compared the performance of thirteen 4 year-olds, thirteen 5 year-olds and thirteen young adults in point-and-click tasks. As expected, we found age had a significant effect on accuracy, target reentry and Fitts' law's index of performance. We also found that target size had a significant effect on accuracy and target reentry. Measuring movement time at four different times (first entering target, last entering target, pressing button, releasing button) yielded the result tha Fitts' law models children well only for the first time they enter the target. Another interesting result was that using the adjusted index of difficulty (IDe) in Fitts' law calculations yielded lower linear regression correlation coefficients than using the unadjusted index of difficulty (ID). These results provide valuable guidelines for the design of graphical user interfaces for young children, in particular when it comes to sizing visual targets. They also suggest designers should adopt strategies to accommodate users with varying levels of skill. (UMIACS-2003-42) (HCIL-2003-16)Item Measuring FlowMenu Performance(2003-01-21) Guimbretiere, FrancoisThis paper evaluates the performance characteristics of FlowMenu, a new type of pop-up menu mixing command and direct manipulation. FlowMenu was compared with marking menus on a simple selection task, and with tool palette selection on a task that combined selection with drawing. Our results compared with those in previous experiments indicate that FlowMenu offers as much of an advantag over tool palette selection as does Toolglass, a two-handed technique. At the same time, it is not significantly slower than marking menus. Additional results show that selection performance depends on distance around the menu, but not on initial position or direction. These results provide a guide for the design of high-performance menu configurations. Keywords: FlowMenu, marking menu, tool palette, Tool-glass, empirical studies (UMIACS-TR-2002-88) (HCIL-TR-2002-17)Item On Merging Command Selection and Direct Manipulation(2003-01-21) Guimbretiere, FrancoisWe present the results of a study comparing the relative benefits of three command selection techniques that merge command selection and direct manipulation: one two-handed technique , Toolglass, and two one-handed techniques , control menus and FlowMenu. Our results show that control menus and FlowMenu are significantly faster than Toolglass. Further analysis suggests that merging command selection and direct manipulation is the key factor in the performance of all three techniques. Keywords: FlowMenu, control menus, tool palette, Toolglass, empirical studies (UMIACS-TR-2002-91) (HCIL-TR-2002-20)Item Paper Augmented Digital Documents(2003-04-04) Guimbretiere, FrancoisPaper Augmented Digital Documents (PADD), are digital documents that can be manipulated either on a computer screen or on paper. PADD, and the infrastructure supporting them, can be seen as a bridge between the digital and the paper worlds. As digital documents, PADD are easy to edit, distribute and archive; as paper documents, PADD are easy to navigate, annotate and well accepted in social settings. The chimeric nature of PADD makes them well suited for many tasks such as proofreading, editing, and annotation of large format document like blueprints. We are presenting an architecture which supports the seamless manipulation of PADs using today's technologies and reports on the lessons we learned while implementing the first PADD system. Keywords: Paper Augmented Digital Document, Paper based user interface, digital pen UMIACS-TR-2003-40