Make it easy for engineers to make changes to the system in the future.
The ease with which you can modify a data system, and adapt it to changing requirements, is closely linked to its simplicity and its abstractions: simple and easy-to-understand systems are usually easier to modify than complex ones. But since this is such an important idea, we will use a different word to refer to agility on a data system level: evolvability.
Source: «Hongyu Pei Breivold, Ivica Crnkovic, and Peter J. Eriksson: “Analyzing Software Evolvability,” at 32nd Annual IEEE International Computer Software and Applications Conference (COMPSAC), July 2008. doi:10.1109/COMPSAC.2008.50»