The Teacher unit differs from the resource unit in degree of specificity : it is focused and planned for a particular group of student and is formulated to teach a limited number of concepts,skill, and values . Before developing a teaching unit the teacher may make use of a resource unit. The teaching unit ensure that there is a purpose to the day -to -day lesson it represents long range planning for teaching the curriculum . Unit activities should include a broad range of processes and experiences ,such as problem solving , research skill activities language development. Gramatic activities.