**6.1. Data collection and preparation**

Data used in experiments originate from the Birmingham Pilot. Data have been acquired by monitoring 3 Care recipients during a 6-month period (from January to July 2017, and ongoing). Sensory data are collected using Nokia Steel (e.g., Withings Activité) smartwatches. Nokia Steel tracks the following activities: sleep cycle, movements tracking, walked steps and distance, burned calories, elevation, heart rate, and optionally SP02 (peripheral capillary oxygen saturation, an estimate of the amount of oxygen in the blood, taken with additional pulse oximeter). Integration of sensor data with City4Age analytics platform is described in the following text. The proximity positioning data are gathered through smartphone BLE transceiver and relayed through the smartphone 4G connection to the City4Age Platform. Nokia/Withings API is used for initial pre-processing step on the sleep, activity, and other data obtained from the smartwatches, before sending to the City4Age Platform. So, input for building clustering algorithms in this research was sets of activity measures for each citizen. Summary of observed activity measures is presented in **Table 1**.
