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I expected to have a full understanding of Hadoop and Mapreduce functions and how/when to use them. I have a better, but still only partial understanding of the material I had hoped to master in this course. Lesson 4 needs to be have better supporting material; to clarify what is being taught. I would also improve the assistance given to students. Although Udacity advertizes a high level of assistance and tutoring for students, I received very little assistance and nothing I would even close to tutoring during the course. ** it should be noted that this course was not free for me. I was paying $199 for the course. So I may have expected more assistance than would be expected from a free course.