Within the MOSAICS European Industrial Doctorate (EID) programme four Early Stage Researchers (ESRs) are being trained to become experts in auditory implants to achieve minimized outcome spread and maximized participation in society. Each ESR is conducting research in a specific area, though the results and outcomes of their individual projects feed into one another and will be combined to better understand the large individual differences and unexplained variability reported in auditory, speech, and language functioning of individuals after CI implantations.