A series of behaviors linked together in a continuous sequence by cues, and maintained by a Anything a...Anything a... Anything a animal will work to obtain. at the end of the chain. Each Cue A stim... More serves as the Marker A s...Marker A s... Marker A signal used to mark desired behavior at the instant it occurs. The A toy nois... is a Marker A s.... and the Anything a... for the previous behavior, and the Cue A stim... More for the next behavior.