Capacity Planning of an Hospital intranet with a multiclass workload. The project of an intranet of an hospital with a 3-tier architecture is described. The two class closed model with a fixed number of customers has been analyzed. Two different what-if analyses are given: increasing the number of customers and modifying the mix of the jobs in execution. We use the following tools of the JMT suite: JSIM for simulation, JMVA for exact solutions and what-if analyses, and JABA for the bottleneck identification.