Christine Wacta
Systemic design is increasingly asked to operate not only as a reflective practice but as an implementable infrastructure in high-stakes domains such as aging-in-place. This paper reports on R.A.B. Brain Commons, a cyber-physical platform deployed across small residential care homes (three to eight beds) in Georgia, USA, that translates pluralist systemic design principles into a working socio-technical system. The platform integrates four epistemically distinct streams of knowing, passive wearable signals, Bluetooth Low Energy (BLE) zone detection, caregiver GeoEmotion input, and resident biographical identity, into a per-resident Behavioural Digital Twin (BDT). The BDT in turn drives a composite Cognitive Commons Index (CCI) whose five sub-indices are initialised at equal weight. Rather than subordinating tacit, emotional, and biographical knowledge to biometric data, the system treats them as co-equal signals within a single adaptive loop under caregiver override.
The work sits within systemic design pluralism (Jones, 2014; Ryan, 2014; Sevaldson, 2022) and draws on a wider theoretical lineage that includes the Situationists’ insistence on lived spatial experience (Debord, 1955, 1958), Jacobs (1961) on eye-level urban intelligence, Gehl (1971/2011) on public-life method, Lefebvre (1974/1991) on the production of space, Tuan (1974, 1977) on topophilia, Star and Griesemer (1989) on boundary objects, Haraway (1988) on situated knowledges, Latour (2005) on actor-networks, Suchman (2007) on human-machine reconfigurations, and Escobar (2018) on pluriversal design. The paper argues that R.A.B. Brain Commons constitutes a concrete instance of operationalised pluralism, a running tool in which multiple, coexisting ways of knowing are not merely represented but instrumented as system inputs, weighted as co-equal contributors, and made architecturally accountable to the people they describe.
The paper walks through the four-layer cyber-physical architecture, the methodological lineage in prior peer-reviewed work on GeoEmotion mapping (Wacta, 2020, 2023a; Wacta et al., 2023b; Wacta and Liu, 2025), the deployment state across three Georgia testbed sites, and the field observations from staff-mediated adoption at Site 1 (Pooler, Georgia). It then situates the platform within systemic design pluralism by identifying three generative tensions, the weighting problem, the articulation cost of tacit knowledge, and the override paradox, that surface only when pluralist commitments are encoded into a running platform rather than declared in a methodological posture. The contribution is a practice-based demonstration that pluralism in systemic design can move from methodological stance to deployable infrastructure, and a reflection on the design ethics such a move demands.
Keywords: systemic design pluralism, cyber-physical systems, Behavioural Digital Twin, GeoEmotion mapping, Cognitive Commons Index, aging-in-place, participatory sensing, boundary objects, situated knowledges, practices and tools