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<p><b>Editor's Perspective: </b>Planning technology is arguably at the core of autonomy capability. Autonomy is all about dealing effectively with uncertainty in a remote operational context. Effective autonomy ultimately comes down to asking the question repeatedly: "And what to do now?" Planning is a key technology here. But, as these authors articulate, planning must be tightly woven with execution and resource management to create autonomy as a continuously available overall system-level capability, designed in at the start, and hard to identify with any single component technology. The planning technology described here, Casper, will contribute to a flight-based technology experiment onboard the Air Force?s Techsat-21 constellation of satellites in 2004 that this department described last year (P. Zetocha et al., "Commanding and Controlling Satellite Clusters," Nov./Dec. 2000, pp. 8-13). —Richard Doyle</p>

R. Knight, B. Engelhardt, R. Sherwood, G. Rabideau and S. Chien, "Casper: Space Exploration through Continuous Planning," in IEEE Intelligent Systems, vol. 16, no. , pp. 70-75, 2001.
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