In making a determination, the tribunal—
(a) may inquire into, and inform itself, of anything in the way it considers appropriate; and
(b) may seek and receive written or oral statements from any entity it considers appropriate; and
(c) may act with as little formality as it considers appropriate; and
(d) must have regard to effective and efficient processes in carrying out its functions; and
(e) is not bound by the rules of evidence.