Two items I have thought of.

1. In addition to putting a modification tag at the top of the code with 
who/date/what, we also will assign a job number to the mod in addition to a No 
for the mod. Such as mod 01. Then throughout the code where the changes are 
made we put a tag such as *<<01>> start  and *<<01>> end or, just a single tag 
at the end of the line if only one or two lines being changed. This makes the 
changes very easy to search for and spot should there be problems in the new 
code.
2. Consider when to use a paragraph and when to use a program. Paragraphs 
(proc) certainly has their uses, but when the paragraph gets to using IF, Case, 
locate, etc seems time to use a program.  For two reasons. One being while 
paragraphs (at least in SB+) can do a lot, getting it to do everything a 
program can do can be difficult. If you have an involved paragraph, sooner or 
later you'll be adding to it and find you can't easily add what you want to 
add, that it needs to be a program. Second reason being some of the commands 
are different syntax in a paragraph vs a program, why learn/memorize or have to 
look up two different syntaxes? 
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