guesteditorial continued Towards Longitudinal Monitoring of Activities of Daily Living " by Bennett et al. discusses how well-being assessment builds in layers from specific sensors and knowledge through to holistic views of an individual through the fusion of many sensor systems. We end on a cautionary note. While we believe the future of home and ambient sensing is bright, we need to be careful of the limitations. " Wearable Devices and Diagnostic Apps: Beyond the Borders of Traditional Medicine, But What About Their Accuracy and Reliability? " by Cosoli et al. discusses the potential measurement challenges associated with novel assessments such as wearables. We hope that this special issue has shown the potential for sensors and smart home technology to move from convenience to proactively supportive systems that can truly enable independence for many individuals whether that be to support declines in function related to aging. These systems have the potential to directly improve the lives of older adults, and also support care partners and care professionals, to ultimately allow people to age in place. 4 IEEE Instrumentation & Measurement Magazine September 2021