Incremental Program Development 
As programs become more complex, changes have a tendency to 
introduce unexpected effects.
-  Incremental programming tries to isolate the effect 
of changes by changing the program in a slow and controlled 
manner
-  The program implementation model becomes:
-  define types / compile / fix;
-  add load and dump procedures / compile / test;
-  add first processing function / compile / test / fix;
-  add features / compile / test / fix;
-  add second processing function / compile / test / fix;
-  keep adding features / and compiling / and testing / 
and fixing.
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