Test-driven development is one of the central techniques of Extreme Programming. However, the impact of test-driven development on the business value of a project has not been studied so far. We present an economic model for the return on investment when using test-driven development instead of the conventional development process. Two factors contribute to the return on investment of test-driv...

Testing is a critical component of modern software development. The problem of designing a suite of test cases is superficially similar to that of designing an experiment to estimate main effects and interactions, but there are crucial differences. Additive models are unhelpful, and classical design criteria are also. We propose a new class of models, and new measures of effectiveness. We compa...

This study aims to investigate preservice computer teachers‘ self-efficacy beliefs and achievement motivation levels for educational software development before and after the ―Educational Software Design, Development and Evaluation (ESDDE)‖ course. A pretest and post test design without a control group was employed. In 2008, 46 senior students (25 male and 21 female) who were enrolled at Comput...

User-testing is a critical activity in software development. However, eliciting appropriate test-users can be difficult. Recent work showed that (during user-testing of educational software) dyslexic final-year students identified a larger number of subtle (yet significant) issues in more detail than other students. However, final year students were not the target users of the software (designe...