Using a learning taxonomy allows the teacher to design learning activities that will allow students to achieve the desired learning objectives in the limited amount of time available in the classroom and for home study/reinforcement. Not all knowledge and skills must be mastered. Some concepts may only be introduced, while others must be reinforced and mastered. A learning taxonomy, such as Bloom's, aids in lesson design. For example, a teacher could have an objective for students to simply have knowledge of a certain biological process or the objective could be at a much higher level. A higher level objective could be to assess the effect of a change to an input in that biological process. A much deeper level of knowledge is required for that higher order learning objective. Rob