At this point we have established the constraints placed on the design for a Net News collaborative filtering system. The system must provide some method of participating anonymously. The system must not impose excessive overhead on the network. The system may not violate the social conventions of Net News by altering or suppressing messages. It must be easy to install the collaborative filtering system, and the system must not cause irreparable damage in the event of a bug. Finally, the system should help users process articles in a quantifiably faster manner. In the next chapter, we will describe the design of a system which meets these requirements.
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