Your product’s success is dependent on and defined by metrics. Metrics are a lens into your product’s health and performance. Defining your metrics, therefore, should be as intrinsic to your product development process as defining requirements.

In fact, metrics are one of the most frequently asked product manager interview questions: How would you define the success metric for feature X?

You can start to see that this very simple model can be applied in any number of ways: 

• Defining success metrics for a new product  
• Determining a new feature’s success and impact 
• Re-vamping metrics for an existing product  
• Fieldi...