What is the PI?

Throughout the CAMI systems, the user will be introduced to a measurement named PI.

The Performance Index (PI) is a composite measurement that has evolved from our speed tests.

Our dilemma was: How do you distinguish between:

Child A - Doing 25 sums per minute at 80% accuracy

Child B - Doing 21 sums per minute at 100% accuracy

We needed a composite score to assess the performance of the learner.

PI is defined as = [Thinking Speed, measured in Sums per minute] x [Accuracy as measured in %]

Then, the PI for child A can be calculated to be = 20 and for child B = 21, making child B the stronger student.

If you wish to add meaning to the PI then it is:

      “The equivalent work rate in sums per minute at a 100% score”.

The results from the SpeedTest can be inserted on this PI Plot:

The sloping lines are lines of constant PI.

The aim is to get a performance index of at least 15 to start with, with 25 - 30 being the average. Anything above 30 is good, above 40 is excellent, and scores above 50 are outstanding.

A "Target" has been indicated on the PI Plot, and with regular usage of the CAMI-Apps SpeedTest, the students will quickly be exceeding this limit.