This goes with doing the first 90% of the work, then the second 90% of the work then the last 90% of the work. And engineers multiplying their initial estimate

This goes with doing the first 90% of the work, then the second 90% of the work then the last 90% of the work. And engineers multiplying their initial estimate by 3, the project manager then multiplying that by 3 and rounding it up to be ten times more than the initial estimate.