Conclusion - IBM 5110 User Manual

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CONCLUSION
When programming for an application using the 5110, break the
application down into manageable parts. To do this, first focus on the
program output. This is the primary interface to the user. It also
de'Fines what the real purpose of the program is. Next, consider all the
input data that is required to generate the output. Finally (and only
then) plan the actual processing.
Thinking in this way should help you make the transition from knowing
th~~
APL language to being able to use the APL language to generate
user-defined functions for specific applications.