Résumé. Les systèmes décisionnels reposent sur des bases de données multidimensionnelles qui offrent un cadre adéquat aux analyses OLAP. L’article présente un nouvel opérateur OLAP nommé « BLEND » rendant possible des analyses multigraduelles. Il s'agit de transformer la structuration multidimensionnelle lors des interrogations pour analyser les mesures selon des niveaux de granularité différen...

Commonly used gralm~mrs which describe i~turai lan~uages /ex. ATN, Metamorphosis Grammars/ can be hardly applied in describing higly inflectional languages. So I propose a grammar called the grammar with natural context which takes into consideration properties of higly inflectional languages /ex. Polish / as well as structural languages /ex. English/. I introduce its normal form.

This paper describes the key notions of situated cognition, Vygotskian thought (zone of proximal development, the general law of cultural development and the mediational nature of signs and tools), and learning from the community of practice perspective. From these notions, we conceptualize principles on learning through which design considerations relevant to the web-based e-learning environme...