Teachers have choices in the types of texts and teaching methods used for content learning. Textbooks provide a basic overview but should be supplemented with trade books, magazines, newspapers and other sources. When selecting texts, teachers consider the readability, fairness, and how well the content and format work together for student comprehension. Teachers also make decisions about communication roles, grouping patterns, teaching tools, and assessment tools. Formative assessments help guide instruction while summative assessments evaluate learning. Lesson plans outline goals, materials, instruction, and evaluations. Experienced teachers adapt plans based on students' needs.