Problem: Summarize in a few simple sentences: A Fixed Interval (FI) schedule is a reinforcement schedule in which reinforcement becomes available for the first response that occurs after a fixed amount of time has elapsed since the last reinforcement. The organism must wait for the specified time interval to pass, and then the first response after that interval produces reinforcement. Example: In an FI 2-minute schedule, after reinforcement is delivered, a 2-minute interval must pass. Once those 2 minutes are up, the very first response the organism makes will produce reinforcement. If the organism responds before. Need Assignment Help?