The document summarizes several landmark cases that helped establish the legal concept of duty of care in tort law: 1) Winterbottom v Wright established that a contract alone does not create a duty of care to third parties not in privity of contract. 2) Donoghue v Stevenson established that manufacturers owe a duty of care to consumers to take reasonable care to avoid injury from their products. 3) Grant v Australian Knitting Mills extended this duty to manufacturers of clothing that caused injury to the plaintiff when worn.