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title:Recap VI
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# Discussion
#### Advantages of Petri Nets (Standard)
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- No explicit modeling of time. (hard to indicate _when_ and _how long_)
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title: Recap VII
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### Two Claims about Modeling
**Claim 1: There are many ways to model the same system.**
The first claim says that there are many Petri Nets that can model a given system.
For example, we can model the elevator in the exercise differently.
With a Petri Net, we can describe the state of the elevator by the distribution of the tokens in place _above_ and _under_ corresponding to the number of floors above and under the current floor of the elevator. (See live demo)
**Claim 2: Many systems can be modeled in exactly the same way.**
There can be several systems that correspond to a given Petri Net. (See live demo)
There are trade-offs: e.g. Simplicity vs Comprehensibility.
Choice of modeling is often subjective and depends on the taste and experience of the designer.
