employee { # Employee
  n1: circle label:"Start Reference Check"
  n4: diamond label:"Make Reference Check decision"
  n7: rectangle label:"Continue Reference Check process"
  n10: circle label:"End Reference Check"
  n1.handle(bottom) -> manager.n2.handle(top)
  n1.handle(bottom) -> hr_system.n3.handle(top)
  n1.handle(right) -> n4.handle(left)
  n1.handle(bottom) -> manager.n5.handle(top)
  n1.handle(bottom) -> hr_system.n6.handle(top)
  n1.handle(right) -> n7.handle(left)
  n1.handle(bottom) -> manager.n8.handle(top)
  n1.handle(bottom) -> hr_system.n9.handle(top)
  n4.handle(right) -> n10.handle(left)
  n7.handle(right) -> n10.handle(left)
}

manager { # Manager
  n2: rectangle label:"Receive Reference Check request"
  n5: rectangle label:"Update records for Reference Check"
  n8: rectangle label:"Continue Reference Check process"
  n2.handle(right) -> employee.n10.handle(bottom)
  n5.handle(right) -> employee.n10.handle(bottom)
  n8.handle(right) -> employee.n10.handle(bottom)
}

hr_system { # Hr_System
  n3: rectangle label:"Review Reference Check details"
  n6: rectangle label:"Continue Reference Check process"
  n9: rectangle label:"Continue Reference Check process"
  n9.handle(right) -> employee.n10.handle(bottom)
  n6.handle(right) -> employee.n10.handle(bottom)
  n3.handle(right) -> employee.n10.handle(bottom)
}