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# The mythical man-month
## Chapter 1: the tar pit
* "Program": complete in itself, ready to be run by the author on the system on which it was developed.
What we initially develop and delivers some value is normally a program.
* "Programming product": can be run by anybody, in any operating environment, for many sets of data.
A programming product is thoroughly tested.
A programming product is thoroughly documented.
A programming product costs three times the cost of the program.
* "Component in a programming system": works as a part of a larger product.
A component in a programming system follows a well-defined interface.
A component in a programming system is tested in integration.
A component in a programming system costs three times the cost of a program.
* "A programming systems product" is a programming product and a component in a programming system.
A programming systems product costs nine times the cost of a program.
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