A team can describe the same improvement using time or rate, but the percentages need not match. Define the measure before writing a headline about a prototype's performance.
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Use a matched task
In a fictional comparison, the same specified task takes 90 seconds with version A and 60 seconds with version B. Assume the task output and relevant conditions are comparable.
Time falls by 30 seconds on a base of 90, so the time reduction is one third, approximately 33.3%.
Calculate a rate separately
The completion rates are 1/90 and 1/60 task per second. Their ratio is 90/60 = 1.5, corresponding to a 50% rate increase.
Both descriptions can be correct, but calling a 50% rate increase a 50% time reduction would be wrong. The denominators describe different quantities.
Check what the data actually support
A single timing comparison does not establish a stable average for every user. Experience, assistance, task order and errors could affect the result.
If users completed different tasks, the numerical comparison would need a different interpretation. Do not trade accuracy for a stronger-sounding percentage.
Write a transparent finding
State the task, measure, observed values and limitations. Label fictional teaching numbers as fictional; retain source records for real observations.
This original example teaches general business-project reasoning, not official CBPA scoring criteria or a completed submission. Follow organiser and school requirements for real participant work.
Continue reading: CBPA Business Projects: Build a Sales Forecast You Can Explain.
Contact Hanlin
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Official information and further reading: Source 1
