Philadelphia Union head coach Jim Curtin answers your questions this exclusive interview with The Coaches' Voice. In part one, he talks about his team's focus on producing homegrown talent, the challenges that come with the MLS salary cap and the coaches that have had the greatest influence on him. In part two, he explains what he thinks it will take for the USA to become a true footballing superpower, selects his favourite formation and explains what, in his opinion, makes a great coach.