<ul><li>Earlier enterprise systems had rigid input environments like IBM’s black-screen interfaces, providing stability and predictability through controlled transactions.</li><li>Modern UIs operate similarly to transaction systems, but with event-driven logic, creating complex DAGs of dependencies that lead to potential state and interaction path issues.</li><li>Allowing out-of-order navigation and ad hoc corrections in UIs sacrifices reliability and simplicity for hidden complexity and defect-prone logic.</li><li>To address these challenges, developers should design clearer state models, structure validations carefully, and manage the system like the complex state machine it is.</li></ul>

The Hidden Structure of UI: A Transaction System in Disguise

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