In a startup, most of the time you do not even know what the variables are that can affect the outcome; so you have to guess and hope for the best. The learning

In a startup, most of the time you do not even know what the variables are that can affect the outcome; so you have to guess and hope for the best. The learning comes from examining the outcome and then discovering all the variables you never even knew existed - so you go back and change your hypothesis or product to deal with the new variables. And so it goes...