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Architectural Guidelines
It is as important to decide what a system is not as to decide what it is. Do not serve all the world's needs; rather, make the system extensible so that additional needs can be met in an upwardly compatible fashion.
The only thing worse than generalizing from one example is generalizing from no examples at all.
If a problem is not completely understood, it is probably best to provide no solution at all.
If you can get 90 percent of the desired effect for 10 percent of the work, use the simpler solution.
Isolate complexity as much as possible.
Provide mechanism, rather than policy. In particular, place user interface policy in the client's hands.
From Scheifler & Gettys: "X Window System"
The Layout of <filename>/usr/src</filename>
The complete source code to FreeBSD is available from our public repository. The source code is normally installed in <filename>/usr/src</filename> which contains the following subdirectories:
Source for files in <filename>/bin</filename>
Utilities covered by the Common Development and Distribution License
Source for files from contributed software