The document discusses tracking and measuring the effectiveness of advertising campaigns, websites, and applicant tracking systems (ATS) for recruitment. It recommends setting goals and key performance indicators (KPIs) and mapping the jobseeker journey to understand what can be tracked. Measurement tools like Google Analytics, campaign tags, and custom URLs are suggested to track metrics like clicks, applications, and cost per hire from different advertising mediums and stages of the candidate journey. Regular testing, optimization, and repeating the process is emphasized.