Llegories as intented in the morality plays.

I am seeking to have a clear constructed definition of an allegory and its possible assumed forms. The 11 page paper must explore the allegory as a mode of representation and attempt to classify it into generic categories.

I want 2 pages to be devoted to the relationship between Allegory and Moral: how an allegory uses a moral aspect as a mode of representation.

My future intent is to use that definition and see how it will play out in three morality plays.

This essay must be easily comprehensible, well detailed but not too simplistic.

For the time being my sources are:
Allegory and Representation.
Publisher: The Johns Hopkins University Press; Reprint edition (March 1, 1986)
Language: English
ISBN: 0801833450

Allegory and Violence.
Publisher: Cornell University Press (December 1, 1996)
Language: English
ISBN: 0801429951

This is my beginning:
The allegory as intended by this work. (unfinished)
Confronted with many perspectives, it is important, as a starting point, to pose one guiding definition of what this paper means by the notion of allegory. According to the Columbia encyclopedia, an allegory serves as a  disguised representation for meanings other than those indicated on the surface . The allegory is indeed a figure of speech by which meaning can be produced and, as it has to be sought beyond the actual appearance of things, it requires, according to its level of subtleties, an active mental involvement on the part of its pursuer.
On a first surface level, the allegory is concerned with a narrative and the forms assume by this latter. Independently of the type of narrative involved in the story, may it be prose, verse, drama or simply oral speech, the commonest type of allegory pertains to the storyline. The author narrates his/her events in a certain fashion and he/she orders them according to his/her inclinations. The careful selection of words or a deliberate misuse of them taints the story with a certain atmosphere. Identifiable themes emerge according to sections or passages, and these emerging themes are often played out and interwoven among themselves. They offer a plus-value to a narrative plot for they grant it with alternative meanings and interpretations. Not only is the narrative embellished by this process, but most importantly it acquires new significances and depth. By this rhetorical means a drama may well contain traits belonging to a slapstick comedy or vice-versa a jolly lighted comedy may indeed reveal itself to be tragic and dreadful. As mentioned above, the delimitations of themes as well as their intrinsic refinements are seldom made explicit and often call for the reader s own expertise and undeniably his/her willingness in finding them.
On a second level, characters and protagonists involve in a course of events may convey ideas, embody qualities or display emotions that the author wishes to present.