I. Any given program, when running, is obsolete.

II. Any given program costs more and takes longer.

III. If a program is useful, it will have to be changed.

IV. If a program is useless, it will have to be documented.

V. Any program will expand to fill available memory.

VI. The value of a program is proportional to the weight of its output.

VII. Program complexity grows until it exceeds the capabilities of the programmer who must maintain it.

VIII. Any non-trivial program contains at least one bug.

IX. Undetectable errors are infinite in variety, in contrast to detectable errors, which by definition are limited.

X. Adding manpower to a late software project makes it later.