Social Digital Twins: A Public Sector Adoption Blueprint

What Are Social Digital Twins?

While traditional digital twins focus on physical assets replicating aircraft engines, power grids, or buildings, Social Digital Twins expand this concept to model the interplay between people, institutions, and infrastructure.

Fujitsu defines Social Digital Twins as dynamic digital representations of societal systems that integrate behavioral, environmental, and institutional data to simulate real-world outcomes. These models are designed not just to describe the present, but to explore alternative futures, helping leaders visualize the impact of policies across domains such as health, mobility, public safety, and climate.

In contrast to conventional decision-making, which often relies on historical data and assumptions, SDTs enable real-time, scenario-based simulations. Policymakers can test ideas in a safe, virtual environment, anticipating ripple effects and adjusting interventions for greater impact and equity.

Why Governments Need Social Digital Twins Now

The public sector has historically lagged behind in digital transformation, but the urgency of today’s challenges and the limits of linear planning make the case for SDTs particularly compelling.

• Interconnected Challenges Require System Level Thinking:
Issues like climate adaptation, energy transition, and healthcare are deeply interconnected. SDTs allow governments to model how a change in one area (e.g., introducing congestion charges) affects others (e.g., air quality, public transit usage, and economic access), leading to more holistic and effective policy design.

• Policy Resilience Through Simulation:
In an age of uncertainty, whether pandemics, economic shocks, or natural disasters, SDTs serve as digital sandboxes where governments can test strategies under multiple stress scenarios. For example, Fujitsu has worked with local governments in Japan to model citizen behavior during earthquake simulations, enhancing emergency preparedness.

• Enhanced Citizen Engagement and Trust:
SDTs can serve as interactive platforms for public participation. By making complex policy scenarios visible and tangible, they help citizens understand tradeoffs, voice preferences, and co-design solutions, fostering transparency and democratic legitimacy.

Fujitsu’s Vision: Human Centric, Purpose Driven Innovation

Fujitsu is among the global technology leaders actively developing and deploying Social Digital Twins in the public sector. Under its “Technology and Service Vision,” Fujitsu emphasizes that SDTs must serve a broader mission: enabling a regenerative, resilient, and inclusive society.

In one flagship initiative, Fujitsu collaborated with municipal governments in Japan to model how urban development plans affect pedestrian flows, accessibility for the elderly, and environmental outcomes. The SDT revealed unforeseen bottlenecks and equity issues, prompting planners to revise their designs in favor of more accessible and sustainable urban environments.

Crucially, Fujitsu embeds these simulations within a human-centric and ethical framework, aligning technological innovation with public value. Their commitment to “Trusted AI” to ensure transparency, fairness, and accountability makes their methodology a credible reference for governments seeking to adopt SDTs responsibly.

A Four Part Blueprint for Public Sector Adoption

Despite their promise, Social Digital Twins are not plug-and-play. Public sector adoption requires a phased, intentional approach. Based on Fujitsu’s work and broader industry insights, here is a four-part blueprint for successful implementation:

1. Start with High Impact Use Cases
Early pilots should focus on specific, high-priority challenges where SDTs can deliver clear value:

• Urban mobility: Model the impact of bike lanes, pedestrian zones, or new transit systems on traffic and accessibility.

• Healthcare planning: Simulate the effects of community health interventions on chronic disease prevalence.

• Disaster resilience: Test evacuation protocols and citizen responses in simulated extreme weather events.

Fujitsu’s experience shows that starting small while embedding robust measurement and feedback loops builds momentum and trust across agencies.

2. Establish Ethical, Interoperable Data Infrastructure
SDTs depend on integrating diverse data sources sensor networks, health records, public datasets, and behavioral analytics. However, with this data richness comes increased risk.

Governments must invest in robust, ethical data infrastructure by:

• Ensuring citizen privacy and informed consent.

• Promoting interoperability across public and private data platforms.

• Auditing models for bias to prevent the reinforcement of existing inequalities.

Fujitsu emphasizes the importance of trusted data ecosystems, where transparency, data sovereignty, and fairness are embedded from the outset.

3. Build Internal Capabilities and Ecosystem Partnerships
Successful SDT adoption requires more than technical talent. It demands systems thinking, public engagement expertise, and cross-disciplinary collaboration. Governments should:

• Invest in training programs that develop skills in data science, simulation modeling, and participatory design.

• Partner with academia, civic tech organizations, and industry to co-develop models and iterate use cases.

• Create innovation sandboxes where policies can be simulated and stress-tested in a low risk environment.

Fujitsu’s partnerships with universities and cities have shown that co-creation is a force multiplier, helping ensure that SDTs reflect real-world complexity and citizen priorities.

4. Design for Transparency and Co-Creation
The most transformative potential of SDTs lies in their ability to reshape public participation. Citizens should not just be data sources, but active participants in modeling and decision making.
Practical approaches include:

• Interactive dashboards that let users explore different policy scenarios.

• Citizen assemblies or panels that interpret simulation results and propose adjustments.

• Gamified platforms that make complex tradeoffs more understandable and engaging.

Fujitsu advocates for a participatory approach in which citizens co-own the simulation process. This fosters deeper trust and ensures policies are grounded in lived realities.

Avoiding the Pitfalls

Despite their benefits, Social Digital Twins come with risks:

• False precision: Overreliance on simulations can lead to unwarranted confidence in specific outcomes.

• Model bias: Poorly designed models may replicate societal inequities.

• Opacity: Without clear communication, SDTs risk being perceived as black boxes.

To mitigate these risks, SDTs should be treated as decision support tools, not decision makers. Assumptions must be transparent, regularly validated, and informed by continuous citizen input.

As Fujitsu notes, “A Social Digital Twin must reflect the complexity of society—not reduce it.” This mindset is essential to ensuring SDTs enhance, rather than constrain, democratic governance.

Fujitsu Social Digital Twins: Pioneering Sustainable Solutions

Fujitsu's Social Digital Twin (SDT) technology seamlessly integrates real-time data from various sources, enabling digital simulations of complex scenarios across diverse physical and social systems. This innovative approach enhances our ability to predict and plan with precision, grounded in a comprehensive understanding of current realities.

A prominent application of Fujitsu SDT is in reducing carbon emissions from transportation. As a committed member of the World Business Council for Sustainable Development (WBCSD), Fujitsu actively contributes to pioneering initiatives that leverage SDT technology, particularly in the realms of transport and mobility.

Real-World Applications:

• Isle of Wight, UK: Fujitsu SDT was instrumental in calculating real-time CO2 emissions within the transport network and forecasting potential peaks, facilitating proactive environmental strategies. Explore the Isle of Wight case study

• India: Fujitsu is conducting a pilot project to optimize the deployment of electric vehicle (EV) charging infrastructure, ensuring strategic resource allocation and promoting sustainable mobility. Discover the India EV Charging Pilot

You can find out more about how Fujitsu is combining digital technology with multidisciplinary knowledge to solve complex and diverse social challenges on the Fujitsu Research Portal https://en-portal.research.global.fujitsu.com/converging-technology/ or watch the video https://youtu.be/UZnWku3kECY.

Conclusion

As digital and physical systems converge, governments are gaining the power to test decisions before they take effect. Social Digital Twins offer more than operational insights—they enable systemic transformation.

By embedding SDTs within ethical frameworks and participatory processes, public institutions can create smarter, fairer, and more resilient societies. The blueprint is clear: begin with real needs, build trusted data ecosystems, empower public servants, and put citizens at the center.

Fujitsu’s pioneering work demonstrates that this vision is not hypothetical, it is already happening. The question is no longer if governments should adopt Social Digital Twins, but how quickly they can move from exploration to implementation.

In a world of rising complexity, SDTs offer a powerful truth: We do not need to predict the future; we need to simulate it together and act with clarity, confidence, and collective intelligence.

Why not talk to the Fujitsu Wayfinders team or visit our Social Digital Twin website (https://keytechshowcase.com/category/social-digital-twin/) to find out how Social Digital Twins could be of benefit to your organization?