Final answer:
A CTRS should complete an Incident report when two clients run away on a community outing, as it provides an official record and initiates a formal investigation into the event.
Step-by-step explanation:
When two clients run away on a community outing, a Certified Therapeutic Recreation Specialist (CTRS) should complete an Incident report. This form is critical in documenting any unexpected event that negatively affects the safety, security, or well-being of the clients or staff.
The incident report helps in creating an official record, initiates a formal investigation, and is used to develop preventive measures to avoid similar incidents in the future. A revised treatment plan may be necessary afterward, but the initial step is to report the incident. Referral summaries and liability summaries are not the appropriate forms for this situation.