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Ecological Interface Design (EID) is a design paradigm that addresses the cognitive interaction between users and systems. EID’s original application domain is the field of process technology. However, in several studies the techniques outlined for EID are applied to other domains. In the development of EID interfaces for two different tasks involving control of the locomotion of an aircraft, the authors experienced a gap between the stages of cognitive work analysis (CWA) and the actual design of the interfaces. This paper analyses the approach in the two projects, generalizing the findings in creation of a proper representation with the Abstraction Hierarchy (AH) identified in the CWA stage. For these, and probably other projects, it appears advantageous to consider alternative and possibly parallel expressions for the constraints identified at the Abstract Function level of the AH, to create a match between either user controls and the representation, and between system purpose and the representation.