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The key points from this module are:
The Shelterwood System is a method of securing natural tree reproduction under the shelter of old trees which are removed by successive cuttings to admit to the seedlings a gradually increasing amount of light.
The stages of the Shelterwood System

Preparatory felling
Seeding felling
Secondary felling
Final felling

The Selection System involves the removal of mature timber either as single scattered individuals or in small groups at relatively short intervals, repeated indefinitely, where an uneven-aged stand is maintained
The Selection System can be applied to:

Rugged topography areas
Remote areas
Areas with irregular seeding