Which researchers provided foundational work on collaborative filtering concepts in 1994?
Answer
Resnick and Gray
The text explicitly identifies the research put forth by Resnick and Gray in 1994 as foundational to the core concepts underpinning Collaborative Filtering (CF). This early work helped establish the theoretical basis for systems designed to predict user preferences for items they had not yet experienced. While other figures like Konstan and Tipping were also important later milestones, Resnick and Gray are credited with the initial foundational contribution in that specific timeframe regarding CF principles.

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