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Let's update our summary table with some of the new techniques we've covered:

	Maintainability	Performance	Data sharing	Ease of use
Subroutines
Called Programs
Copybooks
Internal Procedures
Procedure Copybooks
External Procedures (bind by copy)
External Procedures (bind by reference)
Bind By Reference (with binding directories)
Bind By Reference w/Binding Directories & Binder Source

We can see that using bind by reference (service programs) and taking advantage of binding directories & binder source gives us the best of all worlds.  This is however, the most complicated architecture, and may not be suitable in all situations.  It may require significant system rewrites - but it may also be worth the effort.

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Last Modified:  September 11, 2000