When you decompose a DFD from one level to the next,there is a conservation principle at work and we must conserve inputs and outputs to a process at the next level of decomposition.

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When decomposing a DFD, we must ensure that all inputs and outputs to a process at the higher level are conserved at the next level of decomposition. This conservation principle helps maintain the integrity of the system being modeled.

When You Decompose a DFD from One Level to the Next,there