While rudimentary, the courses qualify referees to control fixtures up to U21 level, though a whistle blower's progress is often dictated by the time, knowledge, skills and fitness they bring to the role.
Specific professional development is held by senior referees on an ongoing basis, including a popular initiative that sees referees work midweek with players at club trainings.
"It's mutually beneficial," said Greenstreet.
"Players see the referees as not just some guy out there with a whistle, but as ordinary people who like having a chat and a beer after the game. The referees are seen as something other than guys out there trying to catch players and get a better understanding of what individual players and teams are trying to achieve." Greenstreet believes Brett Johnson to be the model of a former player who can make a rapid rise through the refereeing ranks.
His manner, athleticism, and man management skills, coupled with an impressive understanding of the game, has seen him appointed to premier games this year after only beginning officiating in 2011.
It is believed refereeing offers a way for many current and former club players to stay connected to the game.
The positions are unpaid, apart from a small amount of money for travel.
