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Now, you should have all the tools you need to investigate how data are currently organized for the device you want to model. To supplement this, you should also get in touch with the SLAC colleagues whose research focuses on changes in your device. Sometimes, there is high demand to model a particular PV behavior, and people will be interested in simulacrum services that include that PV behavior. Now that you know which PVs you want, it's a good time to look at a dissection of one particular simulacrum service. The next chapter will walk you through the basic structure of the sc_rf.py so you can start copying and pasting the framework for your own service. "Dissecting a Simulacrum Service" (https://confluence.slac.stanford.edu/x/Lrs7Eg). Don't worry about understanding every bit of syntax in there yet. You will learn a lot by copying + pasting from existing services until something doesn't behave the way you want it to. That article will also include examples of putter functions, which you will read about in Simulating PVs 1: caget and caput as well as Simulating PVs 2: putter functions.