How to configure surprise shorties

When running a skill-based treatment (SBT) session with the Target set to AUTOMATIC, the Target CAB will be randomly chosen based on:

  • the current SBT level of the student, and
  • the {CAB}RewardProbability expressions.

The chosen target will never exceed the current SBT level of the student. But an earlier target (surprise shorty) can be chosen by evaluating each {CAB}RewardProbablity expression in order from cFCR to the current SBT level. If any of the expressions resolve to true, then that CAB becomes the target of the next EO trial.

Surprise shorty example

The current SBT level of the student is CAB1 and the {CAB}RewardProbability expressions resolve to the following values:

CABResolved valueTarget probability
cFCR0.3330.333
TR0.500(1 - 0.333) * 0.500 = 0.333
CAB11.000(1 - (0.333 + 0.333)) * 1.000 = 0.333

In this example, cFCR will be randomly chosen as the surprise shorty 33.3% of the time, TR will be randomly chosen as the surprise shorty 33.3% of the time, and CAB1 will be the default target 33.3% of the time.

Default shorties

Using the default configuration for all {CAB}RewardProbability expressions, the probability of rewarding each level based on the current level of the student can be seen in the following chart:

Default shorties probability chart (1198x740)