Learning physical activities such as sports and games is expensive and time-consuming. A common advice is "repetition makes perfection," which implies that wrong actions must soon be noticed and avoided. A knowledgeable tutor is often required to provide good feedback for that purpose. However, this facility is available only for those…

Concurrent engineering or overlapping activities is a business strategy for schedule compression on large development projects. Design parameters and tasks from every aspect of a product's development process and their interdependencies are overlapped and worked on in parallel. Concurrent engineering suffers from negative effects such as excessive…