1. Contrastive analysis involves comparing pairs of languages to identify their differences and similarities, with the goal of informing fields like language teaching and translation. It provides a link between linguistic theory and practical application.
2. In the mid-20th century, contrastive analysis was explicitly formulated and widely used to predict difficulties in foreign language learning based on comparisons of the native language and target language. However, it lacked foundations in learning psychology and its predictions proved unreliable.
3. More recent contrastive analysis focuses less on direct applications and more on theoretical questions of why languages differ, informed by linguistic typology. It aims to increase language awareness for learners rather than predict errors.