Ecological Interface Design

Ecological Interface Design (EID) is a design methodology developed by Kim Vicente and Jens Rasmussen that bases the visual representation of a complex system on the underlying constraints and laws of the work domain rather than on the designer's assumptions about what the operator needs. The interface is a cognitive affordance — a structure that makes the deep properties of the system directly perceivable and actionable.

The theoretical foundation of EID is the abstraction hierarchy from cognitive work analysis. The interface is designed to represent the system at multiple levels of abstraction simultaneously, from physical form to functional purpose, so that the operator can navigate the hierarchy as the situation demands. An ecological interface does not tell the operator what to do. It reveals the structure of the problem so that the operator can reason about it.

EID has been applied in nuclear power control, process control, and anesthesia monitoring. It is distinguished from conventional interface design by its commitment to representing the work domain itself rather than the tasks the designer expects the operator to perform. The operator is treated as a problem-solver who must adapt to unanticipated situations, not as a rule-follower who must be guided through anticipated scenarios.

• Cognitive engineering — the broader field of applying cognitive science to system design
• Cognitive Work Analysis — the constraint-based framework that provides EID's theoretical foundation
• Abstraction Hierarchy — the multi-level representation tool used in both CWA and EID
• Situation Awareness — the cognitive state that ecological interfaces are designed to support