Every startup is an experiment and the reality is that most of them fail. This is because they're complex systems with multiple moving parts, all of which have to work properly to make sure that the company continues to grow. This can be extremely challenging for the founder, who has to juggle multiple balls , and make sure he doesn't drop any of them. This is daunting task, because you need to learn on the job - which is why it's very hard to know whether you're on the right track or not. Are you chasing the right customers ? It can be extremely hard to track all this stuff, especially when there is so much uncertainty , and it's easy for things to fall between the cracks.