I am an SAS programer with a BA in computer science and 14 years of SAS experience. I have helped train junior programmers on the job and tutored graduate students at the University of Pennsylvania. I teach basic good programming practice, starting with defining the problem and looking at the layout of the data. When developing a report or a dataset it is useful to think of the data as a piece of paper and discuss in what ways we need to cut, fold and paste it together to get the result we...