A means of dividing up both the school or college day and also the steps or components of the learning process. In schools and colleges, lessons are usually between 40 and 60 minutes long, and may sometimes run end to end in a ‘double lesson’ for those subjects where lengthy activities are essential, such as art, games, and practical sciences. A summary of what lessons are being taught where and when is set out in the timetable. For the teacher, the lesson represents a unit of planning and preparation. For each lesson a lesson plan is drawn up which sets out the aims, the learning objectives, the topic or topics to be covered, the activities and methods to be used, the methods of assessment, the resources required, and the arrangements made for differentiation by task or by assessment. Each lesson constitutes a subsection of the scheme of work which is drawn up from the programme of study, syllabus, or course specification, so that, taken together, the complete sequence of lessons for the duration of the course of study in one subject is a process of translating these into learning activities and tasks in order for the specified learning outcomes to be achieved and assessed.