TOSCANA is a computer program which allows an online interaction with
larger data bases to analyse and explore data conceptually. It uses la
belled line diagrams of concept lattices to communicate knowledge code
d in given data. The basic problem to create online presentations of c
oncept lattices is solved by composing prepared diagrams to nested lin
e diagrams. A larger number of applications in different areas have al
ready shown that TOSCANA is a useful tool for many purposes.