Software product line engineering is a very common method for designingcomplex software systems. Feature modeling is the most common approach tospecify product lines. The main part of a feature model is a special tree offeatures called a feature diagram. Cardinality-based feature diagrams providethe most expressive tool among the current feature diagram languages. Themost co...

We introduce the concept of parallelism in diagram geometry, we apply it to a new gluing concept that provides geometries of higher rank, we combine it with another recent extension procedure for geometries and collect many examples solving existence questions for geometries over specified diagrams.

A diagram that shows at a glance the social network and support of patients was found useful in a follow-up study of patients with strokes. We believe that the diagram would prove valuable in medical case records and should be an essential part of medical-social reports, particularly for patients at risk of losing their independence.