To examine interface issues in an educational software program, we recruited twenty-two users in health sciences departments for a usability study. Using the GramStain-Tutor (GST) CD-ROM, these users performed tasks in navigating the program and using various interactive features. Their actions and comments were recorded with a digital video recorder and an audio recorder. The main results of o...

In a previous study, we analyzed data from a field study to determine the usability problems in a groupware system. That 75% of the system use was asynchronous surprised us. Consequently, we suspected that the user-centered method that had been employed in that evaluation, might have been insufficient to detect problems related to such heavy asynchronous use. Re-analysis of the data using an ar...

Although software engineers extensively use a Component-Based Software Engineering (CBSE) approach, existing usability questionnaires only support a holistic evaluation approach, which focuses on the usability of the system as a whole. Therefore, this paper discusses a component-specific questionnaire for measuring the perceived ease-of-use of individual interaction components. A theoretical fr...

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silica ferric hydrogensulfate is an efficient heterogeneous catalyst for the cyclization of 2- aminochalcones to the corresponding 2,3-dihydroquinolin- 4(1h)-ones. this intramolecular aza michael reaction was carried out in high yields using chalcones bearing of electron donating and electron withdrawing groups. the catalyst is reusable without significant decreases in its activity after four t...

Parallel and distributed programs often have hardware/problem speci c optimizations for improving quality of the program such as e ciency and robustness. Those optimizations, unfortunately, degrade portability and re-usability as they are intertwined with the original algorithm description. Re ective languages, which provide the application programmer extensible and abstract implementation of t...

Since the beginning of software development re-usability has been an important aspect. Applying reusable elements the software does not have to be developed from scratch, proved solutions can shorten the software development life cycle and make applications safer. There are several forms of re-usability like function libraries, class libraries, design patterns, component technologies and enterp...

In a usability study on a portion of the Census Bureau Web site, we assess how people of different ages search for specific information by evaluating performance and strategy differences between age groups. We collected usability metrics of accuracy and efficiency, including mouse click data. Eyetracking data were also collected including eye-movement patterns in predefined areas of interest. T...

In this paper we propose an architecture for specifying the interaction of non-player characters (NPCs) in the game-world in a way that abstracts common tasks in four main conceptual components, namely perception, deliberation, control, action. We argue that this architecture, inspired by AI research on autonomous agents and robots, can offer a number of benefits in the form of abstraction, mod...

The mashup paradigm allows end users to build custom web applications by combining data-exchanging components in order to fulfill specific needs. Since such building blocks typically originate from different third party vendors, compatibility issues at component interface level are inevitable. This decreases re-usability and requires skilled users or automatisms to provide the necessary mediati...