(Not exhaustive by any means)
(Most of this changes of course based upon where the mission goes)

General Constraints:
	Money		($500mil? $1bil? More?)
	Time		(5 years? 10 years? More?)
	Technology	(COTS? Mil? FC?)
	People		(International? USA only? Government? Industry?)
	Will/Politics	(Across administrations? Pet project?)
	Distance	(Inner planets? Outer planets? Deeper?)

Mission Types:

Robotics:
	Landing method? (Parachute, rockets, airbags, liquid landing)
	Power source? (Solar, RTG, Nuclear)
	Rover (Size? Wheels? Arms?)
	Lander (Non-movable)
	Orbiter	
	Return Mission (How does payload return?)
	Instruments:
		How many? What type? Power consumption? Memory allocation? CPU resources? Radiation enviroment? New designs?

Manned:
	Crew Size
	Mission length
		One way
		Return
			Timeframe
	Orbiter? Lander? Rover? Permanent base? Launch from LEO? Moon?
	Life support
		Consumables? Power?

Getting there:
	Rockets
		Single? Multiple? Assemble in space?
	Gravity Assist
	Exotic Technology / Demostration?
		Solar Sail? Ion Engine? Prometheus?

Communications:
	Custom network
	NASA network
	Frequency? (Microwave, laser)

Science Support:
	Ground based observations?
		Before? During? After?