The spine is covered in one material (i.e. cloth) while the sides with another material (i.e. paper)

The proportion of spine material to side material is approximately 1:3

The corners are not covered in a quarter binding

n.b. Occasionally a reinforcing material (paper on vellum) will be placed over the corners of the board but are then covered with the side materials, and so are not seen. This is not considered covered-corners.

The example shown here: One quarter brown cloth with printed paper sides.

The spine is covered in one material while the sides with another

The proportion of spine material to side material is approximately 1:1

The spine and small area of corners is covered in one material (i.e. leather) while the sides with another (i.e. cloth)

The proportion of spine material to side material is approx. 1:1

The example shown here: Half brown leather with morocco grain cloth sides.

A large spine and corner areas are covered in one material (i.e. leather) while sides with another (i.e. cloth)

The proportion of spine and corner material to side material is approx. 3:1

n.b. In this example, if the corners were not covered, the depth of the spine material into the sides would classify it as a half binding

The example shown here: Three-quarter green leather with marbled-paper sides.