I do it a little different. I like mixed case for comments and remarks but like uppercase for the actual code. The mixed case comments and remarks are easier to read and the uppercase code is quite distinguishable from the comments and remarks.
You might think that is hard to code but it isn't because I code everything in mixed case and then run an ISPF EDIT macro written in REXX which analyzes the code to find what is actual code and what is remarks and comments. It translates the code it finds to uppercase. It leaves code in quotes in mixed case with the exception of symbols in quoted strings. John
