How do you know your site is succeeding? How do you know if that redesign was worth it? How can you justify your work to clients or management? You need a way of measuring success.

Consider establishing design KPIs alongside business KPIs and create a more holistic and healthy mix of metrics that capture user experience and business goals.

Good design decisions are intentional. They aren’t guesses nor a matter of personal preference. They are deliberate and measurable. Over the last few years, I’ve started using design KPIs that inform and guide design decisions. - by Vitaly Friedman