To measure channel performance, you need to define your campaign goals and key performance indicators (KPIs). Your goals should be specific and measurable outcomes, such as increasing brand awareness, generating leads, or boosting sales. Your KPIs are the metrics that indicate how well you're reaching your goals, like impressions, clicks, conversions, or revenue. Depending on your goals and channels, you may use different KPIs. For instance, if your goal is to increase brand awareness, you may use KPIs like reach, impressions, views, or followers. If your goal is to generate leads, you may use KPIs such as click-through rate, landing page visits, or form submissions. To collect and analyze your channel performance data, you can take advantage of various tools and methods like analytics platforms (e.g., Google Analytics), tracking codes (e.g., UTM parameters), dashboards and reports (e.g., Google Data Studio), and attribution models (e.g., last-click). These will help you gain valuable insights into how well your campaigns are performing.