Hi - a good starting point for loop construct is - <a href="http://schemecookbook.org/Cookbook/IdiomLoopingConstructs">http://schemecookbook.org/Cookbook/IdiomLoopingConstructs</a> Which talks about the usage of do and named let. I also find Jens' eager comprehension informative - <a href="http://scheme.dk/blog/2006/08/eager-comprehensions-for-black-belts.html">http://scheme.dk/blog/2006/08/eager-comprehensions-for-black-belts.html </a> If you have a list, then even map or fold can work for you: > (map   (lambda (x y)     (display y))   '(0 1 2 3 4 5 6) ; value of i   '(Sun Mon Tue Wed Thu Fri Sat)) ; index SunMonTueWedThuFriSat(#<void> #<void> #<void> #<void> #<void> #<void> #<void>) The example probably doesn't fit your needs - but hopefully the idea is clear. <div>On 5/1/07, SpinyNorman <<a href="mailto:jmcaxolotl@gmail.com">jmcaxolotl@gmail.com</a>> wrote:<blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;"> I see that there is a standard way of getting date info such that Sunday through Saturday are days 0 through 6.  I want to generate text for a week's worth of days.  The part I am not clear on is how the iteration should work.  I *think* the relevant control word is "do". But of course, the HelpDesk isn't incredibly helpful when you search for "do" -- it complains of too many matches.  "(do" gives too few. While I was looking up "begin," I did see some pretty good doc on "do," but it looks as if it allows for some very sophisticated variations, whereas I need something really basic -- just count up from zero, use the index for a calculation, and when you get to seven (or after passing six), stop.  Also, some of the other functions used in the "do" examples are not yet familiar to me. Or should I use letrec? Please feel free to point me at the appropriate place in the embarassment-of-courseware-riches. _________________________________________________   For list-related administrative tasks:   <a href="http://list.cs.brown.edu/mailman/listinfo/plt-scheme">http://list.cs.brown.edu/mailman/listinfo/plt-scheme </a> </blockquote></div>