Concepts for a system to provide planetary defense against asteroids are being discussed worldwide. It is fair to say this complex system is in very early design stages'. By applying the Complex System Sustainment Management Model (CSSMM) to this design problem, insights on system design can be explored. This paper does that and explains why a Planetary Defense System should be designed in such a way that it can be continually demonstrated to be effective, reliable, available, survivable, economical, anti-fragile, and safe & sure. This leads to a design where the majority of the system is predictable state-of-the-practice hardware and software; the system is made up of many copies of subsystems so that aggregate analysis can be used; and the system is maintained in a state of constant and continuous upgrades. This paper is based on the author's 30 Jun 2018 presentation to the LA-LV Mini-Conference on Planetary Defense Against Asteroids.
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