Hi Joel,

> Of course, in cases where the nature of the data are somewhat
>  "up in the air" (e.g. the problem is more vaguely specified,
>  or the designer is given latitude to choose data/representation
>  structures) there's clearly not so much heuristic guidance.

But why do I only ever get such problems!?
  
>  Also, if the structure of the data changes, it may imply
>  significant rework of the program.

That's a crucial point. You can be utterly 100% confident that anything that 
involves humans will change and usually completely unpredictably. The changes 
can hit any part of a system, and cumulatively -- if not instantly -- can have 
devasting effects.

I don't think any methodology addresses the need for continual, random change.

>  Again, we'll certainly agree that the juggling and comprimises
>  made when shoehorning a 10-pound algorithm into a 5-pound
>  interpreter are at least as much art as science!  ;-)

Yes, well that makes it more fun!

Sunanda.
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