As a general rule, a contract must be fully performed before any payments are made. Which is an exception to this rule? Operation of law Substantial performance Incapacity Conditions Which of the following actions would constitute a legal strike while no collective agreement is in force? a refusal by employer to allow employees onto the job site a slowdown of work by employees a walkout by employees without warning employees take action without notice Which of the following are not negotiable instruments? Cheques Certified cheques Bill of sale Promissory note A person can use mistake as a defence to void a contract dispute if: The mistake is about the subject matter The mistake is a typographical error in the contract The mistake is that both parties have changed their mind The mistake is unknown to both when they signed the contract