The normal, the anticipated difficult and the unanticipated difficult airway are trained in the patient safety simulation center (University Hospital Zürich) and the training is being observed by video installation.

Step 1: normal airway (Phantom), technical training

Step 2: difficult airway (SimMan 3G), technical training

Step 3: Simulation of normal and difficult airway management on ICU (SimMan 3G), technical and non-technical (CRM - crew resource management) training.

Inclusion criteria:

• doctors and nurses with a minimum of 12 moths of work experience.

Exclusion criteria:

• staff members that deny participation or don't meet the inclusion criteria

Doctors and nurses working on the surcical ICU.