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A workflow is composed of states, only at most one of which will be in use for assigned to a particular patient at a particular time; for example, an HIV program might have "registered", "ready for ARV", "on initial ARV regimen", "on other 1st line regimen", "on 2nd line regimen", "defaulted", "lost to follow-up", "died", etc. Some states are "initial" states, to which patient may be assigned upon entry into the program; other states are "terminal" states – when a patient is assigned to this state, the patient's participation in the program comes to an end.
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