ZPE interfaces are now ready.

public interface Reportable
  public function print_report()
end interface

public structure risk_register implements Reportable

  private $risks = []
  private $next_id = 1

  public function add(string $title, string $owner, number $probability,
                      number $impact, string $mitigation) : number
    $risk = make_risk(this->$next_id, $title, $owner, $probability, $impact, $mitigation)
    this->$risks = list_add_element(this->$risks, $risk)
    this->$next_id = this->$next_id + 1
    return $risk["id"]
  end function

  public function print_report()
    print("")
    print("RISK REGISTER")
    print(repeat_text("-", 72))
    print("Open risks: " & this->open_count() & " | Total exposure: " & this->exposure())
    $ordered = sort_risks(this->$risks)
    for each($ordered as $risk)
      print("R" & $risk["id"] & " [" & $risk["state"] & "] " & $risk["title"])
      print("    Owner: " & $risk["owner"] & " | P=" & $risk["probability"] & " I=" & $risk["impact"] & " Score=" & risk_score($risk))
      print("    Mitigation: " & $risk["mitigation"])
    end for
  end function

end structure