While many writers have produced comprehensive guidelines to assist developers of conventional print-based learning materials, few have produced similar sets for designers of technology-based resources supporting flexible delivery. This paper explores some of the issues surrounding the design and development of Web-based materials and provides some firm guidelines which have been used successfu...

The Tools and Materials Metaphor is a design methodology for interactive software systems. It supports developers with both metaphors on how to interpret and understand an application domain as well as concrete techniques on how to actually construct systems according to the metaphors. The construction process is best supported by an application framework that captures those parts of the metaph...

To match the NBER business cycle features it is necessary to employ Generalised dynamic categorical (GDC) models that impose certain phase restrictions and permit multiple indexes. Theory suggests additional shape restrictions in the form of monotonicity and boundedness of certain transition probabilities. Maximum likelihood and constraint weighted bootstrap estimators are developed to impose t...