CONTENTS

 1     Scope of specification technique
 2     Approach
        2.1     Data versus functions
        2.2     Consequences
        2.3     Data design
 3     Reference model
        3.1     Overview
        3.2     Scope
        3.3     Subdivision of the external layer
Annex  A – Guidelines for HMI developers
        A.1     Introduction
        A.2     Method
        A.3     Data design
Appendix  I – Additional guidelines for data designs
        I.1     General
        I.2     Design of classes
        I.3     Design of identifiers
        I.4     Derived data and level of detail