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End-user programming in smart homes addresses tasks that range from very simple to very complex. In this study we investigate how task complexity impacts performance when using two different visual programing representations: form-filling and data-flow programming. We invited 16 participants to create rules to solve smart-home situations of varying complexity and analyzed their completion rates for...
Several cases are known where faults in spreadsheets have caused severe losses of money for companies. Besides other factors, the non-existence of advanced testing and debugging mechanisms in environments like MS Excel causes faults in spreadsheets to remain undetected. In this paper we describe the main functionality of the EXQUISITE tool, a software system and add-in to MS Excel that was developed...
The frequency of programmers attempting to use code examples has prompted significant research on code examples for text languages. Yet, few systems address issues in novice use of examples in blocks programming languages. Research has begun to explore the difficulties novices have using examples in blocks programming languages. This work addresses one such issue: novices often do not notice or focus...
In this showpiece, we demonstrate the functionality of Quality Hound — an online program analysis tool that takes as input a Scratch project and presents to the user a visual representation of the detected quality problems. Made accessible via a browser-based user interface, Quality Hound is instantaneously accessible to any Scratch user all over the world. The design of Quality Hound is informed...
This showpiece will present iSnap, an extension of the block-based, novice programming environment Snap!, which supports struggling students by providing on-demand hints and feedback that help them complete programming assignments. iSnap extends the existing syntactic scaffolding offered by block-based programming to additionally support the implementation of programming tasks. Research on iSnap has...
Many instructors consider a programming environment replete with a large variety of interactive objects and commands a liability for teaching introductory programming. In fact, such an environment is an important pedagogical tool, whose instructional capabilities can be amplified by discovery-based programming praxes — predefined programs with embedded comments that instruct students to browse and...
We present a visualisation of Melbourne pedestrian count data and a visual metaphor for representing hour-level temporal dimension in this context. The pedestrian count data is captured from sensors located around the city. A visualisation web application is implemented that incorporates a thematic map of these sensor locations with a 24-hour clocklike polygon that shows pedestrian counts at every...
In this paper we describe how to use a Game-Based Learning (GBL) approach to help end-user programmers to develop Computational Thinking (CT) skills. CT represents a framework consisting of a set of skills such as: abstraction, decomposition and more in general problem solving expressed in a computational form (algorithmic thinking) that can be easily formalised into a computer program. Those skills...
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