# Justification
1. Introduce the situation
	1. lab owner building that leaks heat.
	2. Need to control the temperture, provide requirment
	3. But lab is actually variable. conditions change (perturbation)
	4. A robust controller C meets the requirement for all plants in the set P
2. This is doable with the model of the controller
	1. But is this the same with an actual controller?
	2. No. There is some layers of abstraction removed in making a real unit