A PlusCal algorithm is translated into a TLA+ model that can be checked with the TLA+ tools. Therefore, you should first learn to write the initial condition and next-state relation in your TLA+ models. If it does, we say that the other state machine implements the state machine. The TLA+ Language [show] TLA+ is based on mathematics and does not resemble a programming language. Upon first seeing a TLA+ model, some engineers find TLA+ intimidating.