Model of Human-Machine Trust Dynamics
Another piece that was developed as part of my Ph.D. candidacy advanced examination. This artifact was created while addressing the dialogue that takes place between automated systems and human operators and the cycle of trust evolution that results. The illustration presumes that trust updates based only on positive and negative experiences (as has been previously shown). This illustration is important to highlight the varied effect that delayed feedback can have on attitudes of trust; however it is greatly simplified in that it does not consider additional factors that could influence the degree of change when receiving feedback on one’s decision to rely. For example, I would hypothesize that the degree of risk associated with relying on the system and the perceived separation between expected performance and actual performance represent two factors that would also likely play into the degree of influence that receiving feedback on one’s decisions could yield.
Read More...Evaluation of Bluetooth Laser Keyboard
Late to post online, during Fall of 2008 I worked on a group project for my Human-Computer Interaction course here at UB. The assignment was to evaluate and recommend improvements for a HCI of our choice. I suggested, and convinced my group to evaluate a Bluetooth Laser Keyboard (it projects a keyboard onto any flat surface) that I bought from ThinkGeek.com. The project was conducted over the course of the semester and included:
- Modified GOMS-KLM analysis, adapted to estimate the time to type using a standard keyboard versus the laser keyboard
- User personas for different classes of users in order to generate use case scenarios for the laser keyboard
- Online questionnaire via SurveyMonkey.com to gather general keyboard use data for the above personas
- Development of Flash based prototypes to evaluate alternate designs for the laser keyboard to improve typing efficiency
I decided to post this to my portfolio because I was particularly happy with the experimental setup I designed to evaluate prototypes of our redesigned laser keyboard. Our focus was on redesigning the layout of the keys that were projected in order to improve usefulness and usability of the device. In order to evaluate our different proposed changes our experimental setup, diagrammed above, utilized an Adobe Flash created configurable keyboard (you can try them it below using your mouse) which users interacted with by typing on scaled paper versions of the keyboard layouts that we placed under a glass touchscreen panel. This allowed us to essentially place the paper keyboard anywhere and configure it how we wished and then just put the touchscreen on top to allow for typing.
Our recommended designs significantly improved typing speed in an experiment we ran to evaluate our design versus the laser keyboard default layout (n=5, p<.05).
Redesigned Keyboard Layout
