Reading Reflections: Classroom Assessment, Minute by Minute, Day by Day

Three new things I have learned:
1.  When using assessment while teaching, the previous approach has been teaching given material and, at the end of the marking period, testing for who has and hasn't learned the material. The article refers to the previous  approach as quality control.
2.  This article is saying that the new approach to assessment and teaching is quality assurance, where assessment for learning is involved when teaching is adjusted as needed while learning is still taking place. The emphasis is on what students are getting out of the teaching, what students are learning, as opposed to focusing on teaching.
3.  Five broad strategies can be used for teaching and seem to work well with most teachers from all content areas. These five strategies include: clarifying and sharing learning intentions and criteria for success; engineering effective classroom discussions, questions, and learning tasks; providing feedback that moves learners forward; activating students as the owners of their own learning and activating students as instructional resources for one another.
Two connections to my teaching:
1.  I think that teachers should assess as they go and make sure students are learning the material, adjusting as needed. I agree with how the article talks about making sure that the students are learning what they need to learn as the unit progresses, not just assessing at the end or test.
2.  I also like how the article talks about clarifying to students what they need to learn and what the teacher expects them to learn.  I think that it is important to address goals and let students know what we expect out of them.
One question I have:
1.  Why haven't all teachers been using this method of teaching already? It seems as though I have already learned about this is some of my other education classes, and it seems to be the best way to teach students.