While I understand the basics and principles of all 3, and have worked in a past instance that had all 3 established. I haven't ever created or built these before. Now I am working at a new company that doesn't have any of these set up just yet, so I am working with the team to get these established. My question is do you NEED all 3? and is there a particular order they should be created in? or created at the same time? More specifically do you need the revenue model set up? That is were my knowledge is the weakest, and the company is using other tools and what not to analyze the data, so that is why I am not sure it is needed. Thanks to anyone for advice and suggestions!