Methods for defining engineering requirements in an electronic environment are disclosed. In one embodiment, a method includes providing at least one of a set of master requirements and a set of version requirements to be applied to the electronic product definition, and referencing an electronic reference document from at least one of the set of master requirements and the set of version requirements, the electronic reference document including one or more particular engineering requirements to be applied to the electronic product definition. Alternately, a method includes defining a callout linked to the at least one of the set of master requirements and the set of version requirements, the callout being adapted to supersede a conflicting engineering requirement set forth in at least one of the set of master requirements and the set of version requirements.