The binding legal principles established are:
1. A tacit term will only be implied into a contract where it is a necessary inference from the express terms and surrounding circumstances; courts will be slow to import tacit terms into written contracts, particularly settlement agreements.
2. The party alleging a tacit term bears the onus of proving it. The practical test is the officious bystander test - whether both parties would necessarily have agreed to the term if asked at the time of contracting.
3. Terms from a previous agreement between parties will not be tacitly relocated into a subsequent settlement agreement unless the express terms, surrounding circumstances, and subsequent conduct of the parties demonstrate that such relocation was the necessary common intention of both parties.
4. Subsequent conduct of parties, including acceptance of performance that allegedly breaches a tacit term without objection, and delay in asserting rights allegedly arising from such term, has direct bearing on the probabilities regarding whether such tacit term exists.
5. Under common law, in the absence of an express provision or proven tacit term regarding when rental is payable, rental under a periodical lease is payable in arrears after the end of each period, not in advance.
6. Where a settlement agreement is intended to be final and inclusive of all issues relating to the dispute, and parties have negotiated its terms, courts will not readily supplement it with terms from earlier agreements that the parties chose not to expressly include.