This paper discusses criteria for distinguishing attributive (also known as adjectival) clauses and relative clauses, and argues that traditional approaches to these subclause categories and their interrelation lack consistency as well as empirical justification, from a modern Scandinavian perspective. Relative clauses are traditionally and in current Scandinavian reference grammars treated as a formally defined clause type with the attributive function as their prototypical, but not their only, constituent function. In this paper it is argued that the traditional criteria for identifying relative clauses, especially in Danish, Norwegian and Swedish, are essentially not formal but functional criteria, more or less identical to those applied to identify attributive clauses. Indeed, the modern Scandinavian languages, it is argued, hardly offer the empirical basis for a coherent category of relative clauses to be consistently distinguished on formal criteria. Rather, to account for the heterogeneous inventory of subclauses traditionally associated with relative clauses, a general outline of the functional category of attributive clauses in Danish is proposed, based on authentic spoken and written Danish discourse. Traditional definitions of attributive clauses are discussed and refined, and are shown to apply to a different and wider range of Danish subclause forms than has traditionally been recognised.