Professionals are normally bound by a contract with their clients to produce goods or provide services in a professional manner, with due care and in accordance with the contract. However, as we have already seen, the client and others may look for redress through tort for any problems caused by the negligence in the past by persons supplying the product or service. (It is possible that an exclusion clause in a contract may stop an action under contract law but it will not always prevail under the law of tort).
Professionalism regarding an individual's own practice extends to the practice of others in terms of not 'turning a blind eye' to poor, dangerous or unethical practices. If a situation is observed that can a have a detrimental impact on the public good, professionals should make every reasonable effort to ensure that an appropriate decision or action is taken. Indeed, failure to act may result in an individual being liable for not reporting bad practice.