Assessment can be either formal and/or informal measures that gather information. In education, meaningful assessment is data that guides and informs the teacher and/or stakeholders of students' abilities, strategies, performance, content knowledge, feelings and/or attitudes. Information obtained is used to make educational judgements or evaluative statements. Most useful assessment is data which is used to adjust curriculum in order to benefit the students. Assessment should be used to inform instruction. Diagnosis and assessment should document literacy in real-world contexts using data as performance indicators of students' growth and development.