Abstract
Good faith is regarded as a controversial topic under discussion in modern English contract law. Especially with the increasing significance of transnational law the impact of good faith on English law is likely to increase in the future. Though there is no general concept of good faith, according to the circumstances of each case the judges are eager to develop a variety of good faith related principles. Comparison with the German law may also be helpful in making an extended analysis of good faith and creating a more solid and general rule. Also the basic moral notion of honesty may be used for the understanding of good faith. But it should not be forgotten that recognition of a general principle may lead to some uncertainty in the contract law, so the concept of good faith should be solid enough to be certain, but should be flexible enough to be fair.