How has the approach to system design evolved from "Then" $($older systems$)$ to "Now" $($User$-$Centered systems$)$ in terms of Process$-$Control screens?

In the past, Process$-$Control screens focused on transforming input into output, while in User$-$Centered systems, the interface itself becomes an integral part of input and output.

Both Then and Now systems prioritize the seamless integration of input, output, and interface in Process$-$Control screens.

Older systems emphasized a seamless integration of input, output, and interface, while User$-$Centered systems primarily focus on transforming input into output.

Process$-$Control screens in older systems were irrelevant to input and output, while User$-$Centered systems exclusively concentrate on the interface.