The .usim reference

A scenario document identifies patients, observations, resources, and behavior.

Separate content identity, contributor credit, revision history, and clinical review.

Represent multiple fictional patients without ambiguous age units or demographic assumptions.

Make patient information discoverable, with an explicit timeline and disclosure rules.

Use observations for findings, with collection, availability, interpretation, and disclosure separated.

Represent present, absent, unknown, and unasked symptoms explicitly.

Define physiologic variables separately from measured observations and support authored trends.

Give states explicit entry, exit, effects, and role-specific content; separate phases from concurrent conditions.

Allow actions to reveal information, perform work, or change a phase, with conditional outcomes and repeat-use rules.

Specify deterministic scheduled events, repetition, cancellation, and clock semantics.

Resources define reusable content and explicit result delivery.

Separate a medication definition, order, administration, infusion, and authored response.

Model orders, specimens, panels, analytes, and serial results separately.

Package portable media with acquisition context and separate interpretations.

Distinguish rhythm, ECG findings, acquisition settings, and a recording.

Separate airway state, ventilator settings, measured values, and alarms.

Give devices identity, placement, function, and associated measurements.

Specify preparation, observed performance, outcomes, and complications for procedures.

Add reproducible setup, actor behavior, communication exchanges, and reset instructions.

Define the learning audience, preparation, observable objectives, assessment evidence, facilitation, and transfer to practice.

Define bounded conditions/effects and reproducible library composition instead of executable script text.

Define a portable package and enforce role-specific information release in generated outputs.