In going from Block 2 to Block 3, you need to add (read assimilate) new electronic components. The different components talk to each other via electrical wiring that is called system bus. The act of integrating a new device with system bus is assimilation. Relegation is where you allow a component to take over control, for example, a new Full Authority Digital Electronic Control FADEC engine that interacts with flight control surfaces. And redundancy can mean removing something, or having multiple components able to perform similar functions, so they can take over if one fails.