I. Introduction
II. Classification System of a GI Disorder
1. Knowles-Martin Classification System
2. Well-Defined Entities
3. Variable Dysfunction-Symptom Relationship
4. Questionable Entities
5. Entities Related to Behavioral Disorders
III. Diagnosis of a GI Motility Disorder
1. Medical History
2. Laboratory Testing: Complete Blood Count
3. Imaging Studies
4. Manometry Testing
5. Capsule Endoscopy
6. Electromyography
7. Diagnostic Laparoscopy/Laparotomy
IV. Summary