Relevance refers to the appropriateness of an issue in terms of its accordance with the needs, objectives and purposes of the users (learners, teachers, etc.). Relevance can apply to content as well as methodology.
Learner Centredness: Do the materials take into account the personal characteristics of the learners (referring to: content, situations, skills)? This requires a good knowledge of the learners and of their needs and differentiation in the selection and organization of materials to meet them.
Appropriateness: Do the materials suit the learning/teaching context? Do approaches, meta language, instructions, examples, exercises and activities take into account the social, cultural and educational characteristics of the learner in the target group?