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A Delta is a meaningful state change that records that a state field changed from one value to another and should always include the corresponding State event type. A Delta may originate from any connected system and can refer to any meaningful state change in the environment. To better think of what a Delta is? answer the following question:
“What changes do you think, once they become known, will contribute to a better understanding of the environment current state and can help lead to more effective decision-making?”
A Delta is not just an event notification. In D.E.S.P, a Delta is the starting point for impact evaluation, dependency resolution, governance checks, trigger planning, and evidence recording.