# Vossen's Law

## Law

_The likelihood of a repair or modification working is directly dependent on whether you've reassembled everything without testing it first and inversely proportional to the difficulty of disassembling everything in the first place._

### Corollary #1

_If it is REALLY difficult to remove and replace, you will break something else just as you get it back together after fixing the first thing._

This really became clear to me working on servers (especially rack-mounted), cars (especially Hondas) and small electronics.  But it seems like it should apply to just about anything that is a pain to get at or disassemble.

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## Other IT Notes

There is nothing more permanent than a "temporary" solution.

The two hardest problems in IT are:
1. Naming things (& DNS).
2. Cache invalidation.
3. Off-by-one errors.