Three main points related to the definition and characteristics of five important theories. 

1. Liberal Humanism: 

• It is based on the nature of man.
• Unconstrained author of meaning and action.
• Its main focus on literature.

2. Formalism or Russian Formalism: 

• It's original conception of literary history.
• Refers to critical approaches that analyze.
• Focus on the study of poetic language.

• It's a mode of knowledge of nature and human life.
• The focus of "structural laws."
• This theory works in the way people think, perceive and feel.

4. Deconstruction:

• It's based on self-contradictory.
• Literary and philosophical.
• It's almost cliche.

5. Ecocriticism: 

• Nature is represented in texts.
• Recouping nature writing.
• Construct the environment.