Lets put down some common sense statements about how the business works.
| • | Without any workers there is no production. | 
| • | Without any inventory we can't ship. | 
| • | If sales go up for a sustained period we will try to expand production. | 
| • | With no production inventory will never go up. | 
Reality Check information in this form should be kept in the back of your mind as you develop dynamics hypotheses and build a simulation model.