D-,
The first string of fire is 1 shot per second (one-one-thousand, two-one-thousand...).
Second string is 1 shot per half second (one and two and three......)
The last string of fire is 5 shots as fast as you can pull the trigger (1,2,3,4,5,)... should be less than 1.5 seconds for 5 shots.
The KEY is that the shooter MUST be in a perfect intuitive shooting position before they begin shooting, including having their finger touching the trigger. This will allow the person to perfect their fundamentals through the first two strings and really see what they ar capable of, if they take the time to get the fundamentals right, in the 3rd string.
-RJP