We introduce a family of operators to combine Description
Logic concepts. They aim to characterise complex concepts that apply
to instances that satisfy \enough" of the concept descriptions given. For
instance, an individual might not have any tusks, but still be considered
an elephant. To formalise the meaning of "enough", the operators take a
list of weighted concepts as arguments, and a certain threshold to be met.
We commence a study of the formal properties of these operators, and
study some variations. The intended applications concern the representation
of cognitive aspects of classication tasks: the interdependencies
among the attributes that dene a concept, the prototype of a concept,
and the typicality of the instances.