OSBORN'S LAW:
Variables won't; constants aren't

KLIPSTEIN'S LAW OF SPECIFICATION:
In specifications, Murphy's Law supersedes Ohm's.

WHITLEY'S LAW OF THEORETICAL CONSTANTS:
E=mc2 plus or minus 2dB

FIRST LAW OF REVISION:
Information necessitating a change of design will be conveyed to the design staff after - and only after - the plans are complete. ( Often called the "Now they tell us!" Law.)
Corollary:
In simple cases, presenting one obvious right way versus one obvious wrong way, it is often wiser to choose the wrong way, so as to expedite the subsequent revision.

SECOND LAW OF REVISION:
The more innocuous the modification appears to be, the further it's influence will extend and the more plans will have to be redrawn.

THIRD LAW OF REVISION:
If, when completion of a revision is imminent, field dimensions are finally supplied as they actually are - instead of as they were meant to be - it is always simpler to start over.
Corollary: 
It is usually impractical to worry beforehand about interferences - if you have none, someone will make one for you.

LAW OF THE LOST INCH:
In designing any type of construction, no overall dimension can be totaled correctly after 4:40 PM on a Friday.
Corollaries:
1. Under the same conditions, if any minor dimensions are given to sixteenths of an inch, they cannot be totaled at all.
2. The correct total will become self-evident at 9:01AM Monday morning.

LAWS OF APPLIED CONFUSION:
1. The one piece that the plant forgot to ship is the one that supports 75% of the balance of the shipment.
2. Truck deliveries that normally take one day will take 5 days if you are waiting for the truck.
3. After adding 2 weeks to the schedule for unexpected delays, add 2 more for the unexpected, unexpected delays.
4. In any structure, pick out the one piece that should not be mismarked and expect the plant to cross you up.
Corollaries:
1. In any group of pieces with the same erection mark on it, one should not have that mark on it.
2. It will not be discovered until you try to put it where the mark says it's supposed to go.
3. Never argue with the fabricating plant about an error. The inspection prints are all checked off, even to the holes that aren't there.

WYSZKOWSKI'S THEOREM:
Regardless of the units used by either the supplier or the customer, the manufacturer shall use his own arbitrary units convertible to those of either the supplier or the customer only by means of weird and unnatural conversion factors.

THE SNAFU EQUATIONS:
1. Given any problem containing 'n' equations, there will always be 'n+1' unknowns.
2. An object or bit of information most needed will be the least available.
3. Once you have exhausted all possibilities and fail, there will be one solution, simple and obvious, highly visible to everyone else.
4. Badness comes in waves.

SKINNER'S CONSTANT ( FLANNAGAN'S FINAGLING FACTOR) :
That quantity which, when multiplied by, divided by, added to, or subtracted from the answer you get, gives you the answer you should have gotten.


MIKSCH"S LAW:
If a string has one end, then it has another.