Teaching is a deliberate action; its goal is to alter the learner for the better via learning. There are three levels of instruction. Thoughtless Considerate is the memory level. Upper Thoughtful Reflective Level is the conceptual level. Deeply thoughtful Analytic requires formal thought processes and may include mathematics. The Thoughtless Instruction that characterizes most elementary schools involves simply providing students with as much information as possible about a topic (or subject). Such instruction does not require any critical thinking on the part of the student. This is the lowest form of teaching, which we will refer to as "Thoughtless." The next level of teaching is called "Considered". With considered teaching, the teacher selects material that is likely to be useful or interesting to the students. They try to understand what knowledge or skills their students need at this stage of their development. Then they provide material at this level of difficulty. If students can't handle it at first, they should get more help from the teacher. The aim is that eventually every student will reach the level where they can solve the problems themselves. Finally, there is "Analytic" teaching. In this case, the teacher identifies certain concepts within the curriculum that may cause confusion for students and removes them to avoid unnecessary difficulties later on.