A research study to find the knowledge to find out the truth about an event or phenomenon that occurred in the past. The survey research is the search for knowledge and research from the condition.
Research papers from the study to document the truth about the incident. Or occurrence in the past. The survey research to find out the truth from the conditions that existed.
Documentary research study knowledge from documents to find the truth about the event. Or phenomenon occurred in the past. Survey research is a research to find the truth of knowledge state appeared .