The case studies discussed the concepts of breach of contract, frustration of contract, and electronic contracts. In Case Study Group 8, Len's concert was cancelled due to a cyclone, which is considered an act of God that frustrates the contract, releasing both parties from their obligations. In Case Study Group 9, Jenn made an offer to Kirsty through email, but as the offer did not reach Kirsty until after the stipulation period had passed, it can be considered a null and void offer, thus no valid contract was formed.