Disambiguation of DMN Decision Tables.

The Decision Model and Notation (DMN) is a specification for the design of decision models. The logic of those decisions can be expressed in standardized decision tables. The standard allows to create tables that contain overlapping rules. This leads to ambiguities and we argue that such tables are hard to understand and unsuitable for analysis tasks. This paper describes an algorithm to transform ambiguous DMN decision tables to equivalent ones that only contain exclusive rules, thereby resolving ambiguities. We implemented our algorithm and evaluated it against a set of synthetic decision tables.