Aphasia is a communication disorder that hinders the ability to express and communicate with society. Aphasia individual can face difficulties in sentence formation, opinions and trouble with pronunciation. In this survey paper, various techniques have been reviewed based on previous researches including diagnosis and treatment. Automatic diagnosis can evaluate the severity level of aphasia disorder. The important feature of this disorder is that it will not affect their intelligence. This motivated to come up with a speech assessment system which will evaluate speech based on acoustic features. Further, speech will classify into Aphasia quotient score (0 - 100). This system will analyse aphasic speech and provides feedback to the patients. This will help them to improve their speaking and reading skills. © 2020 IEEE.