What are Sign-in / Team-Time-Out, and what reasoning hazard do they counter?

A short, mandatory pause where the whole team out-loud confirms the essentials (right patient, right procedure, known risks) before starting — a checklist ritual that catches errors hierarchy and haste would otherwise hide.

Before a high-stakes procedure begins, the team stops and verbally checks the basics together:

• Sign-in — confirming identity, site and key facts as the case opens.
• Team-Time-Out — a brief collective halt where everyone, regardless of rank, confirms the plan and flags concerns before the irreversible part starts.

The hazard it counters is the combination of time pressure and hierarchy quietly carrying a wrong assumption into an irreversible action. By forcing a structured, spoken cross-check, it turns "everyone assumed someone else had checked" into an explicit shared confirmation — and it also creates a sanctioned moment for Speak-up before things get urgent.

Tip: These rituals are deliberately boring and repetitive. That's the design: a fixed checklist doesn't rely on anyone being sharp in the moment, which is exactly when human attention is least reliable.