In order to measure the effectiveness of your vendor relationships and their impact on your CX, you need to use both quantitative and qualitative methods. Quantitatively, you can use vendor scorecards to track and evaluate performance based on criteria such as quality, timeliness, cost, innovation, etc. Additionally, CX metrics such as Net Promoter Score (NPS), Customer Satisfaction Score (CSAT), Customer Effort Score (CES), and Customer Lifetime Value (CLV) can be used to assess how your vendors influence customer loyalty, satisfaction, and advocacy. Furthermore, you can use Return on Investment (ROI) to evaluate how your vendors help increase revenue or reduce expenses. Qualitatively, customer feedback collected through surveys, reviews, testimonials, interviews, or focus groups can be used to understand how your vendors affect customer emotions, perceptions, and behaviors. Additionally, vendor feedback collected through surveys or meetings can be used to understand how you can improve communication and collaboration with them. Lastly, case studies can be used to showcase how your vendors help you solve specific problems or achieve specific goals.