This series of postings are intended as a summary that includes the most relevant legal principles derived from the English case law dealing with to the contractual formative requirements of offer and acceptance. Offers must be distinguished from other related forms of communication such as invitations to treat, advertisements, displays of goods, and request for tenders. Such forms of communication are not offers and consequently cannot result in a binding contract since they are not capable of being accepted. The requirements of communication of revocations and acceptance are reviewed. The full-text transcript of the cases is freely available at http://www.bailii.org.