Stop show with sound -- Keyboard shortcut: 'x'  Next slide in show -- Keyboard shortcut: 'n'  36 secondsThe Order of Evaluation - slide 21 : 26

Delayed evaluation in Scheme
Scheme does not support normal-order reduction nor lazy evaluation

Scheme has an explicit primitive which delays an evaluation

(delay expr) => promise
(force promise) => value
delay-force-principle.scm
A principled implementation of delay and force in Scheme.
delay-force.scm
Real implementations of delay.