RICE is an acronym for a simple prioritization framework used by product managers to evaluate project ideas. It stands for Reach, Impact, Confidence, and Effort. The framework helps product managers consider each factor about a project idea with clear-eyed discipline and combine those factors in a rigorous, consistent way. The four factors are estimated using multiple-choice scales and then combined into a single score that measures "total impact per time worked". This allows for easy comparison of projects and helps make better-informed decisions about what to work on first. While RICE scores shouldn't be used as a hard and fast rule, they can help product managers think about why a project idea will have impact and be honest about the effort needed to achieve it.