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+(i) Make each program do one thing well. To do a new job,
+build afresh rather than complicate old programs by adding new features.
+
+(ii) Expect the output of every program to become the input to another,
+as yet unknown, program. Don't clutter output with extraneous information.
+Avoid stringently columnar or binary input formats. Don't insist on interactive input.
+
+(iii) Design and build software, even operating systems, to be tried early, ideally within weeks.
+Don't hesitate to throw away the clumsy parts and rebuild them.
+
+(iv) Use tools in preference to unskilled help to lighten a programming task, even if you have to detour
+to build the tools and expect to throw some of them out after you've finished using them.