At present in Europe there are 50 million people living at any one time with multimorbidity. However, our healthcare systems have not been designed to effectively support these people in their daily care needs. ProACT (Integrated Technology Systems for ProACTive Patient Centred Care) is a digital health research programme funded under the European Union Horizon 2020 framework that seeks to address this problem by developing and evaluating a digital integrated care system to support older adults (65 years and over) living with multimorbidity. This poster will illustrate how Patient Public Involvement (PPI) was achieved within ProACT by borrowing existing methodologies, successfully implemented, in the disciplines of Design and Human Computer Interaction (HCI). It offers an example of how the design of digital health interventions can ensure that participants become codesign partners of the final system.