Description Shows the effect an object has on the senses. Description is similar to definition, which focuses on concepts, and to narration, which focuses on time. A good description makes an object concrete for the reader. It often accomplishes this by placing that object in a well-defined context and then focusing on each of the five sensory channels. It will contain sensory words that evoke sight, sound, touch, taste, and smell.
Evaluation Explains the value of an object, event, or concept.
Evaluation is closely related to analysis and comparison. It may rely on description, definition, or narration. Common evaluative writing includes reviews and job-performance analyses. Narration Shows the chain of events in a story. Narration is similar to description, which focuses on objects, and to definition, which focuses on concepts.