In this Chapter you will work through the mechanics of using Vensim with a workforce inventory model. This is a simple, but quite valuable model to study. It demonstrates how the interaction of inventory management policies and hiring practices can lead to instabilities in production. It also demonstrates the somewhat counterintuitive result that being more aggressive about hiring and laying people off can actually lead to a more stable workforce. The workforce inventory model is developed in Chapter 2 of the Modeling Guide.