Number 1: The man holding the concrete hose and directing the flow
Number 2: The man holding the concrete hose upstream
Number 3: The man on the vibrator
Number 4: The man on the vibrator power supply
Number 5-7: The men with the trowels.
You may have noticed that there is one man who has no number. He is the one leaning on the shovel. He is our Number 1 man for the entire job - he is the project manager, Jeff. Being such, he does not fall into the concrete heirarchy at any level.