You cannot get PSA to committed to SFI. You only can explane all advantage of this job. You should be sincere and show that you really enjoy in your work. You should offer your help but you should not do their job instead of them or persuade sombody to work if that person doesn't want to work or believe in successe whitout work. Your PSA must ownself decide if he want to work or don't. And you should not be sad if sombody give up – one day when he mature and then he will back