Final answer:
Modified Wave Scheduling is the tactic that involves having two patients at the beginning of each hour followed by others every 10 to 20 minutes, aimed at balancing provider time and minimizing patient wait times.
Step-by-step explanation:
The scheduling tactic characterized by having patients come in groups of two at the beginning of each hour and then scheduling other patients every 10 to 20 minutes is known as Modified Wave Scheduling. This approach combines elements of wave scheduling, which schedules multiple patients at the top of the hour, with the more traditional scheduling methods that allocate specific time slots for each patient. The purpose of modified wave scheduling is to create a balance between maximizing provider time and minimizing patient wait times, though it requires careful planning and can be complex to manage.