Daniel Herding

Effects of Aging and Domain Knowledge on Usability in Small Screen Devices for Diabetes Patients

Technology acceptance has become a key concept for the successful rollout of technical devices. Though the concept is intensively studied for nearly 20 years now, still, many open questions remain. This especially applies to technology acceptance of older users, which are known to be very sensitive to suboptimal interfaces and show considerable reservations towards the usage of new technology. Mobile small screen technology increasingly penetrates health care and medical applications. This study investigates impacts of aging, technology expertise and domain knowledge on user interaction using the example of diabetes. For this purpose user effectiveness and efficiency have been measured on a simulated small screen device and related to user characteristics, showing that age and technology expertise have a big impact on usability of the device. Furthermore, impacts of user characteristics and success during the trial on acceptance of the device were surveyed and analyzed.

Utilizing a workflow engine to manage semi-automatic correction processes across domains

Workflows are a common model for the description how business processes are done. This paper discusses an approach how workflow engines, which were constructed for handling business processes, can be used to model, develop and handle processes for (semi-)automatic commenting and grading of assignment submissions. Solutions to open-ended questions cannot be corrected automatically in general, but several systems allow a semi-automatic pre-correction for assignments in a specific domain. These systems are mostly re-implementing standard functionality to add a single feature in a completely newly developed system. An approach for modularization of correction process is presented to increase the reusability of functionality. A prototype demonstrates how this approach can be realized by the use of a workflow engine.

Entwicklung einer computergestützten Lernumgebung für bidirektionale Umformungen in der Mengenalgebra

Durch den Einzug des Computers in die Hochschullehre entstehen immer mehr Anwendungen für den Lehrund Lernbetrieb. Lernumgebungen werden verstärkt auch für das außerhochschulische Lernen und den Übungsbetrieb eingesetzt. Zwar wird der Computer von Studierenden als nützlich für die Vermittlung mancher Lerninhalte gesehen, außer in Fächern mit technischem Schwerpunkt (z.B. Informatik, Medizin oder Ingenieurwissenschaften) findet der Einsatz dieser Medien jedoch kaum Akzeptanz bei den Studierenden (vgl. Middendorff S.47ff).

Formatives Assessment in offenen, informellen, vernetzten Lernszenarien

Summary While assessment with closed questions is supported by current Learning Management Systems, there are still shortcomings in formative feedback regarding open-ended tasks. Furthermore, new types of interaction and collaboration in online learning environments have emerged in the last years. This contribution discusses three research questions that have to be answered in order to embed the new forms of assessment in institutional education. Zusammenfassung Während Assessment mit geschlossenen Aufgaben von gängigen Lern-Management-Systemen unterstützt wird, gibt es noch Forschungsbedarf bei formativem Feedback zu offenen Aufgaben. Gleichzeitig haben sich in den letzten Jahren neue Arten der Interaktion und Kollaboration in Online-Lernumgebungen herausgebildet. In diesem Beitrag werden drei Forschungsfragen diskutiert, die es zu beantworten gilt, um die neuen Formen des Assessment in der institutionalisierten Lehre zu verankern.