What type of reasoning does the ATM estimation method rely on?

• A. Exact data from resources
• B. Data-driven empirical data
• C. Reasoned assumptions
• D. Assumption-based estimation

Answer: (D)

Estimating under uncertainty relies on making informed assumptions to drive the calculation. In the ATM estimation method, you model the process using plausible input values—such as average transactions per hour and time per transaction—without relying on exact numbers. These inputs are justified by experience or typical ranges, and you combine them to arrive at an overall estimate. This is why it’s described as assumption-based estimation: the reasoning rests on explicit, defendable assumptions rather than precise data from resources. If you tried to base it on exact data or purely observed measurements, you’d need data you may not have or that may not generalize, which is not how this method is intended to work.