1) Quantitative data and analysis can help drive information architecture decisions by providing measurable insights into what users actually do on a site rather than what they say they do. 2) Quantitative methods like analytics can reveal patterns of user behavior to understand research and purchasing habits, highlight differences between user groups and product categories, and inform tests of content and design changes. 3) Used properly, quantitative data can help justify decisions, improve experiences and features to increase goals like conversions and satisfaction, and predict relevant experiences for users.