We propose the use of a laptop with a program generator and a transistor power amplifier to control the frequency, duration and amplitude of the LED stroboscope flashes. Examples of the stroboscopic photographs are given.

Mplus is a powerful latent variable modeling software program that has become an increasingly popular choice for fitting complex item response theory models. In this short note, we demonstrate that the two-parameter logistic testlet model can be estimated as a constrained bifactor model in Mplus with three estimators encompassing limited- and…

This article reminds readers of the benefits that use cases bring to the software development process. Use cases, as featured in the UML (Unified Modeling Language), are contrasted with the much terser "user stories" favoured by agile methods. With their normal and alternative flows, and extending and included behaviours, use cases…

In this report, we introduce a system for running reimbursed surveys via text messages and mobile cash. The key advantage of this approach is the ability to conduct rapid surveys at an extremely low cost. After reviewing existing literature, we describe an automated system for conducting such surveys and demonstrate its merits in a…

Gamification is the use of game design elements in nongame contexts and has been shown to be effective in motivating behavior change. By seeing game elements as "motivational affordances," and formalizing the relationship between these elements and motivational affordances, it is the position of this article that gamification can be…

Data-handling, processing, and analysis skills are an integral part of a chemist's skill set and, more generally, are highly sought by employers. We report a self-directed workshop to develop and advance these key skills using the popular spreadsheet program Microsoft Excel. Making use of its accessible user interface, various contextualized…

Investigation of the kinetics of phosphorescence decay is a suitable learning task in studying the formal kinetics, and also properties of crystal phosphors. Kinetics of phosphorescence decay of crystal phosphors can be experimentally investigated at home as part of distance learning, using a conventional digital photo camera and a luminescent…

The aim of this study is to investigate the impacts of the use of computer-aided argument maps as a tool to promote prospective teachers' critical thinking skills and dispositions. In this regard, qualitative research method was used in the study. The data of the research were collected through semi-structured interviews. Study group consists of…

This design research investigated the mathematical practices that eight graders (14-year-old students) developed when learning about prisms, cylinders, and their surface areas. An inquiry-based learning environment was created for students to engage in argumentation. The instruction was enriched by use of a dynamic geometry software, namely…

This paper has explored teachers' integration of ICT in a primary school practice, in particular how the content and its subject matter emerge in teachers' preparatory discussions and how they are enacted in the classroom. The theoretical foundation lies in the tradition of "Didaktik" and the analysis focuses on the teachers' choices of…

The "extended Rasch modeling" (eRm) package in R provides users with a comprehensive set of tools for Rasch modeling for scale evaluation and general modeling. We provide a brief introduction to Rasch modeling followed by a review of literature that utilizes the eRm package. Then, the key features of the eRm package for scale evaluation…

Recent work on measuring growth with categorical outcome variables has combined the item response theory (IRT) measurement model with the latent growth curve model and extended the assessment of growth to multidimensional IRT models and higher order IRT models. However, there is a lack of synthetic studies that clearly evaluate the strength and…

The boundaries between accounting and technology is becoming fuzzier as accounting companies are becoming consulting companies. Digital economies are changing business models and companies that do not adept can become obsolete very fast. Even professional organizations are recommending using technology to modernize, automate and expedite…

In order to contribute towards making the teaching of physics more playful and less abstract, we conceived to develop an educational equipment called Planetary Scale. To build it, we used an Arduino microcontroller to assist the teachers of physics in their approach of the ratio between mass, weight force and normal force. To that end, this…

Researchers point at the need to study the creative processes of students in problem solving, as these may indicate how to encourage creative problem solving. The present research attempts to study, based on the heuristic framework of Polya, pre-service teachers' flexibility processes when they solve a mathematical problem with technology. The…