No algorithms, no biased media, no hostile users — yet #polarization still emerges. A new #ABM study extending Axelrod's model shows how rewarding interactions alone fuel a self-reinforcing "rich-get-richer" dynamic. Read the full #OA article in #JASSS: jasss.org/29/2/1.html

#JASSS Vol.29 Issue 2 is out! New research explores online polarization, authoritarian repression, solar PV adoption & financial sentiment spread, and more — all through the lens of #AgentBasedModeling. Find out what #ComputationalSocialScience reveals about society 👉 jasss.org

Can #socialsolidarity prevent agro-pastoral collapse? Paul Chapron & colleagues co-designed an #ABM with Senegalese farmers to find out. ⚠️Spoiler: remove parcel lending & food sharing, and the system collapses #CompanionModeling #participatory #simulation youtu.be/gucSiwhHqW0

Real-world #Policy problems are hard to capture with traditional models, but a #generative approach may change the game. GPLab combines #LLMs and #ABM to advance #computationalsocialscience for public decision support. Read the full #OA article in #JASSS: jasss.org/29/1/6.html

How long before #OpioidPolicy actually reduces deaths? OPOSim #ABM simulates #OpioidUse dynamics in #NorthCarolina to test #prevention strategies and reveals how small shifts can change #epidemic trajectories Read the full #OpenAccess article in #JASSS: jasss.org/29/1/5.html

Can #AI safeguard a healthy #InfoEcosystem? An #ABM simulation shows that proactive #Bots outperform reactive #FactChecking in mitigating the spread of #ConspiracyTheories on #SocialMedia. Read the full #OpenAccess article in #JASSS: jasss.org/29/1/4.html

How do you #model what can’t be measured? This study demonstrates how #ParticipatoryModeling integrates local knowledge and #Calibration to capture hidden social dynamics in complex socio-ecological systems. Read the full #OpenAccess article in #JASSS: www.jasss.org/29/1/3.html

Why do non-political issues polarize? This #MultiAgentModel with #NetworkHomophily solves the discrepancy between #Simulation and #Empirical findings, showing that #OilSpillPolarization can emerge even among moderate partisans. Read the full #OpenAccess article in #JASSS: www.jasss.org/29/1/1.html

The first #JASSS issue of 2026 has been published! Dive into new #SocialSimulation studies on #PublicPolicy, #Epidemiology, #SoilDegradation, and #OpinionDynamics. Read the full #OpenAccess articles in Vol 29(1) here: www.jasss.org/29/1/content...

The #JASSS website just got a major upgrade! 🚀 We have launched brand new dedicated sections for Awards, News, and Videos to highlight the main updates and amazing work happening in our community. Come see what’s new! 💻 www.jasss.org/JASSS.html

#ABM thrives but fragmented code and reinvented wheels slow progress. We introduce #AGENTBLOCKS, an open #community #platform that shares & improves #ReusableBuildingBlocks to support #Standardization in ABM and beyond. Read the full #OpenAccess article in #JASSS: www.jasss.org/28/4/11.html

Structural calibration of ABMs is often overlooked, yet it can dramatically shape model outcomes. We address this by introducing an innovative #InverseModelling #method to #explore & #calibrate #ABM #structures Read the full #OpenAccess article in #JASSS: www.jasss.org/28/4/10.html

Who should be traced first? An empirically calibrated #ABM shows that #ContactTracing works best when prioritizing influential spreaders—even if identified only via simple proxies like #Age and #HouseholdSize. Read the full #OpenAccess article in #JASSS: www.jasss.org/28/4/9.html

By fitting an #ABM of #schoolchoice to household-level data, this study reveals unexpected #heuristic #behaviors shaping #SchoolSegregation dynamics and offers a novel #estimation #framework for realistic ABMs. Read the full #OpenAccess article in #jasss: jasss.org/28/4/8.html

How do #PaymentForPerformance reshape care-seeking? An #ABM of childbirth care in #Tanzania links provider incentives, informal fees, peer learning, and demand pressure, revealing effects of supply-side change. Read the full #OpenAccess article in #jasss: jasss.org/28/4/7.html

Watch #CompanionModeling in action! Etienne Delay (@cirad.bsky.social & ESP Dakar) shares how local farmers and stakeholders co-design #TreeProtection and #agroecological strategies in #Senegal’s Groundnut Basin. Insightful #participatory #simulation 🌱👉 youtube.com/shorts/dGg6Q...

When #tree loss threatens #soils and #food security in #Senegal, the #SAFIRe #participatory #ABM helps communities explore new pathways for #regeneration and reshape #CommunityBased #ResourceManagement. Read the full #OpenAccess article in #jasss: jasss.org/28/4/6.html

Did the #Casarabe Culture truly domesticate the #Amazon? 🌿 New #ABM simulations propose a model of highly localized, intensive #land use driven by environmental 'desirability' & inter-settlement #cooperation. Read the full #OpenAccess article in #jasss: jasss.org/28/4/5.html

MIDAO advances #ABM by showing how specific arguments - not just abstract #socialinfluence - drive #opinion formation and #Innovation adoption. A more realistic, theory-driven perspective on #opiniondynamics. Read the full #OpenAccess article in #jasss: jasss.org/28/4/4.html

Why do a few players dominate #China’s e-retail #market? An #AgentBasedModel demonstrates how small shifts in #consumer risk-taking, pickiness, and #WoM can alter market power in unexpected ways. Read the full #OpenAccess article in #jasss: jasss.org/28/4/3.html

How does deliberation reshape collective judgment? An #AgentBasedModel of the #DoctrinalParadox compares binary voting, belief aggregation, and interaction—revealing when talk helps or deepens contradictions. Read the full #OpenAccess article in #jasss: jasss.org/28/4/2.html

Can models learn realistic human behavior, such as #PedestrianDynamics? This new study applies #AdaptiveGeneticProgramming within #InverseGenerativeSocialScience to evolve stochastic rules in #AgentBasedModels. Read the full #OpenAccess article in #jasss: jasss.org/28/4/1.html

For his excellent reports, promptness, and dedication, the #JASSS Editorial Board is delighted to name @vittonesp.bsky.social among the Best Top 5 Reviewers of the Year!🎓 We deeply appreciate your commitment to #PeerReview, #OpenScience, and the JASSS community! youtu.be/8l0yGwZUN0s

Recognizing her report quality, timeliness, and valuable contribution, the #JASSS Editorial Board proudly names Amineh Ghorbani among the Best Top 5 Reviewers of the Year! 🎓 Thank you for your dedication to #PeerReview, #OpenScience, and our community! youtu.be/mRwBO9eSLB4

We are proud to announce the winner of the 2025 Best PhD Student Article Award: Daniel Torren-Peraire, for "An Agent-Based Model of Cultural Change for a Low-Carbon Transition", published in #JASSS, 27(1), 2024, 13 ➡️ jasss.org/27/1/13.html Congrats! 🏆 youtube.com/shorts/lJ-Ge...

This study rethinks #StakeholderEngagement in #AgentBasedModeling, exploring hidden dimensions of #Expertise, its diverse sources, and its subtle influence on #ComputationalModels and the #ModellingProcess. Read the full #OpenAccess article on #jasss: jasss.org/28/3/10.html

Can #AI accelerate #ABM development? By leveraging #LLMs like #ChatGPT & #Llama, this study shows how automating model feature extraction can transform simulation design & boost efficiency. Read the full #OpenAccess article on #jasss: www.jasss.org/28/3/9.html

What if predicting #behaviorchange was simpler than we thought? Hugo Lyons Keenan, Roben Delos Reyes & @camzachreson.bsky.social show how just two data-driven parameters in a #microsimulation reveal real #learning and persistence patterns. youtu.be/71nq_Hg-Ff8?...

Understanding #behaviorchange is vital to explain collective phenomena. This new #microsimulation captures #learningdynamics with just 2 parameters, offering a validated step toward better #collectivebehavior modeling. Read #OpenAccess on #jasss: www.jasss.org/28/3/8.html

How do #opinions evolve on social media? A new #simulation framework merges #ABM, #LLMs & #ReinforcementLearning to ethically explore topic-specific #influence and the emergence of #opinionleaders in digital communities. Read #OpenAccess on #JASSS: jasss.org/28/3/6.html

An #AgentBasedModel calibrated on South Korea reveals how #financialpolicies —#interestrates and #DSR limits—reshape #marketconcentration. Results expose firm-level mechanisms, thresholds, and macro trade-offs. Read #OpenAccess on #JASSS: www.jasss.org/28/3/5.html

What happens when small task groups have multiple #leaders instead of one? New insights from #evolutionary #gametheory and #ABM reveal the trade-offs between clarity, #cooperation, and #status. Watch the teaser by Prof. Hsuan-Wei Lee! youtu.be/Y_IR7iaKuKw

How do #status #hierarchies shape #cooperation in task groups? Using #ABM and #evolutionary #gametheory, this study reveals that #multileader hierarchies can work—but less effectively than single-leader ones. Read the full #OpenAccess article on #jasss: www.jasss.org/28/3/4.html

This #ABM extends the Hegselmann-Krause framework by adding #dynamic #socialidentity. Results show how #openmindedness and #identity granularity shape #polarization — revealing when diversity bridges divides or reinforces them. Read #OpenAccess on #jasss: www.jasss.org/28/3/3.html

Can #ChatGPT help design agent-based models? This pioneering study shows how #PromptEngineering and #CAISs can support fast, creative #SocialSimulation #modeling. A promising step for #AI in #ComputationalSocialScience. Read #OpenAccess on #jasss: www.jasss.org/28/3/2.html

Can #polarization emerge without echo chambers or repulsion? This #OpinionDynamics #ABM grounded in #Psychology shows how the need for certainty drives ideological alignment—and division—across social and economic issues. Read #OpenAccess on #jasss: www.jasss.org/28/3/1.html

What can a group of three tell us about #opiniondynamics? This study tracks how open and closed #triads evolve in a #abm #BoundedConfidence #model—revealing how consensus (or not) emerges in #socialnetworks. Read #OpenAccess on #jasss: www.jasss.org/28/2/6.html

Why do #substanceuse patterns often follow a U-shaped curve? A simple, theoretically grounded #computationalmodel simulates individual decisions and, for the first time, explains this population-level pattern. Read #OpenAccess on #jasss: www.jasss.org/28/2/5.html

Can #gaming foster real-world #solutions to #wasteissues? Discover how RÁC, an #abm serious game, helps rural communities in #Vietnam build collective strategies for #sustainable #wastemanagement. Read #OpenAccess on #jasss: jasss.org/28/2/4.html

How can we better #communicate complex Agent-Based Models to those who need them most? Zenith Arnejo’s #scopingreview reveals key gaps and strategies to boost #abm transparency, trust, and impact toward stakeholders. Watch the teaser! youtu.be/lHC-RTduIB8?...

Why aren't Agent-Based models widely adopted outside academia? A new #systematic #review reveals key #communication gaps with stakeholders and offers solutions to enhance broader #ABM understanding and effective application. Read #OpenAccess on #jasss: jasss.org/28/2/2.html

How can we evaluate #healthpolicy that depends on life-course outcomes like retirement savings, wealth, or debt? Meet LHIEM—a novel #microsimulation combining path dependency & yearly dynamics for realistic policy insights! Read #openaccess on #jasss: www.jasss.org/28/2/1.html

​​JASSS has issued a corrigendum for "Identifying Personal and Social Drivers of Dietary Patterns: An Agent-Based Model of Dutch Consumer Behavior" (2024). Corrections led to minor adjustments and the overall findings remain consistent. Details: www.jasss.org/28/2/3.html

Is #peerreview the unsung hero of #academicintegrity? Explore Flaminio Squazzoni's editorial on the 'social contract' binding our #scholarlycommunity and discover the new initiatives JASSS is implementing to motivate reviewers! Read the full #openaccess article on #jasss: jasss.org/28/1/6.html

How can we model #disease #spread with both individual granularity and population-level efficiency? This novel #hybrid approach integrates #ABM with #compartmental #models for a nuanced, computationally feasible solution. Read #openaccess on #jasss: www.jasss.org/28/1/5.html

How do human motives, cognitive dissonance, decision strategies, and social influence shape opinions and behaviors within a networked community? Wander Jager introduces "HUMAT", the latest tool for exploring these complex social dynamics. Watch the teaser! youtu.be/TwXdT56yjcI

Meet HUMAT, a powerful #modeling framework that simulates how #social #dynamics—#opinions, #behaviors, and #influence—evolve in #networks. From tech adoption to online debates, HUMAT helps researchers decode social complexity. Read #OpenAccess on #JASSS: jasss.org/28/1/4.html

Ziyuan Zhang breaks down the key findings of his latest article published in #jasss. How does human behavior shape epidemic dynamics? Watch the video to find out how this ABM challenges conventional wisdom on pandemic response and vaccination strategies! www.youtube.com/watch?v=K_1Z...

How does human #behavior shape #epidemic outcomes? This #ABM reveals that as risk perception shifts, so do the effects of #vaccination strategies. The takeaway? No one-size-fits-all solution to #COVIDー19 spread. Read #OpenAccess on #JASSS: jasss.org/28/1/3.html

How do #opiniondynamics shift in social networks? Using field data and #SAOM, this study shows that negative #socialinfluence, not bounded confidence, drives opinion changes—without strong #polarization. Time to revise our assumptions? Read #OpenAccess on #JASSS: www.jasss.org/28/1/2.html