https://medium.com/swlh/input-output-metric-framework-for-product-managers-4be024cb23f1

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The difference between a successful product and an unsuccessful product is the selection of the right metric to measure the success of the product. Without a measurable success metric your product is directionless and hence there is no way to figure out when to take what actions. It’s like a race when one doesn’t know where the finish line is.

These are well defined quantifiable and directly measurable entities that determine the progress made by a product and provide input to further improve the product to achieve better results.

Because :