This is a summary of how SaaS companies can leverage their product usage data to generate more revenue by turning free trials and freemium services into a valuable sales qualification strategy called "product-led" or "PQLs". PQLs are potential customers who have already had a positive interaction with the software, often through freemium versions or free trials, and have achieved specific qualifying actions. These leads convert at a higher rate than traditional marketing-qualified leads (MQLs) and sales qualified leads (SQLs), making them the most valuable type of sales lead for SaaS companies. To create a PQL scoring model, businesses need to identify their most important metrics and use logistic regression to score those metrics and identify qualifying actions. By leveraging PQLs in 4 steps - setting up data architecture, creating a score on unified accounts, routing accounts to the right place, and tailoring sales methods for each type of PQL - companies can generate more revenue by focusing their marketing efforts on generating high-quality leads that are likely to convert into paying customers.