An adjudicator's failure to have regard at all to a relevant provision of the construction contract (as distinct from an error in considering it) is jurisdictional error rendering the determination void. Good faith in the exercise of the adjudicator's power requires a genuine and conscientious attempt to perform the function, and does not admit of capriciousness; resolving a valuation dispute by preferring one party's assessment on the basis that the other party made unmeritorious submissions on unrelated issues is capricious and not a good faith exercise of the power. An adjudication application may include material not in the payment claim, provided it is evidence or argument within the scope or ambit of the payment claim.
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