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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.