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…initial drop-off rate, rate of descent, and terminal value – are direct measure of product-market fit.

Setting up metrics tracking for – or instrumenting – your product takes work.

…qualitative helps you define your product and quantitative helps you optimize your product.

Users who continuously find value in a product are more likely to tell their friends about it.

User habits are a competitive advantage. Products that change customer routines are less susceptible to attacks from other companies.

…naïve entrepreneurs often find that better products don’t always win – especially if a large number of users have already adopted a competing product.

…old habits die hard and new products or services need to offer dramatic improvements to shake users out of old routines.

…products that require a high degree of behavior change are doomed to fail even if the benefits of using the new product are clear and substantial.

…frequent engagement with a product – especially over a short period of time – increases the likelihood of forming new routines.

…understanding why the user needs your product or service is critical.