The term refers to
the following six criteria on literary appreciation and criticism which are
also six key elements in writing: structural layout of writing, choice of words to construct sentences, acceptance and innovation in the style of earlier
writers,
inheriting and transforming
traditional ways of expression, citing examples to support an argument, and
musical rhythm. As a school of literary criticism, the six criteria formed a
key component in the theoretical system established in The Literary Mind and the Carving of Dragons. The six criteria
offered rules that could be followed to avoid subjectivity in literary
criticism. They also provided a framework of theoretical guidance for later
generations of critics and exerted significant influence on the development of
literary theory in modern times.