Most intubations are easy. However, awkward and difficult laryngoscopy is associated with increased morbidity and mortality.

The view at laryngoscopy must always be documented. The scale most widely used (but frequently misquoted) was described by Cormack and Lehane and applies to the 'best view achieved' (Table 1).

Grade 1	Most of the glottis is visible
Grade 2	Only the posterior extremity of the glottis is visible
Grade 3	No part of the glottis, but only the epiglottis, is visible
Grade 4	Not even the epiglottis can be seen

Table 1 Cormack and Lehane classification