I worked at a company that instituted a very similar bonus program, it started just after the time the former COO of Ebay joined ... must have been coincidence. Anyways, we had similar formulas, pretty much the same thing. We were eligible for 6% of our salary but it would be paid out in 4 times a year in 2 different ways.
Our bonus was split in two, half would be used for quarterly bonuses, half would be used for yearly bonuses.
Each Quarter you would make personal goals and take on team goals. Each goal which would be measurable and would contribute to your bonus. They would be scored each from 60-120%. Each employee would have a mix of personal and team goals, totally 5 to 8.
Rather than have yearly goals, your average score of all quarters would be applied to the yearly half.
Finally, there was company goals, revenue and profit. If we met "guidance" we got 60% of our calculated goals above and if we hit the 'BHAG' we got 120%.
.....
So, lets say you are pushing a feature and you get it done super early. You your goal, complete on time, well you get 120%!
Of 1 of your 5 goals. It happened to be weighted at 40%, but fixing bugs on time was 30%. You did that ok, no problems, so that's 100% of a 30% goal. And your team didn't get that CFO cost cutting project at all, so that's 60% of that 20% goal. Some finally team sports participation one gave you the remaining at 100%.
Well how much did you earn from that 120% burst of hard work?
Well, its 120% of 40, so 48 points. 30 points for the team and only 12 points for the CFO one. Finally throw in that 10. So... you got 100% of your bonus.
How much was that, well, its 6% of your salary. But really only 1/8th of that 6%, so if you earned 100,000, that was $750!
Wait how did the company do? Well, Rev was lower than expected, so it was 80% of that. so $600.
Profit? No, the revenue drop ate away the profits. So is that 60% of the $600?
No, the bonus pool was funded from profits, so we get nothing. And.. we didn't made a profit in all quarters but one, one that you didn't bust your ass, so you only got $400.
So year end bonus of 6%? All you see if $400, but your math got better.