A person may develop trust in a colleague from another religious community, rely on him for assistance and maintain a friendship after they stop working together. Yet that relationship may leave the person's beliefs about the colleague's wider community unchanged. This distinction matters for social cohesion policy: interpersonal trust and broader understanding of a community are different outcomes, and programmes designed to strengthen one cannot be assumed to deliver the other.
Schools, workplaces, universities and community programmes frequently create opportunities for interaction across social and religious boundaries. How those interactions are structured may influence whether participants develop lasting relationships, revise existing beliefs or change their behaviour towards unfamiliar members of another community.
How Relationships and Beliefs Develop
Repeated interaction with the same person allows individuals to assess one another's reliability, build trust and develop the familiarity that can make cooperation easier. These relationships can also create lasting social support and economic opportunities, extending the value of contact beyond the immediate setting in which it occurs. But experience with one member of a community may be treated as an individual exception rather than a reason to reconsider existing beliefs about the group.
Contact with a wider range of people offers a different informational advantage. That provides more varied observations against which initial impressions can be assessed, although wider exposure does not by itself guarantee accurate conclusions.
What Happens When People Work Together?
A field experiment in Barasat, West Bengal, offers useful insights into how the design of intergroup contact shapes social cohesion. Conducted between January and August 2024, it involved 964 Hindu and Muslim men aged 18–40 who worked in pairs making paper bags in a purpose-built factory. The experiment compared sustained partnerships, in which participants worked with the same person from the other religious community for six days, with rotating partnerships, in which participants worked with a different person each day. A third group worked with the same partner from their own religious community each day, and a pure control group only completed the baseline and endline surveys without taking part in the factory task.
The effects differed according to the outcome being measured. Sustained partnerships were more likely to translate into continuing social connections: around 60 percent of participants in this group reported recent contact with their assigned partner in an endline survey conducted approximately 18 days after the intervention. Participants in rotating partnerships were 14 percentage points less likely to report recent contact with their work partners. Sustained contact also strengthened social and economic connections, including access to assistance in finding paid work.
Rotating partnerships, however, offered an advantage in correcting certain inaccurate beliefs about unfamiliar members of the other community. This improvement was concentrated among Hindu participants, whose initial beliefs about Muslims left greater scope for such correction. Exposure to different people may therefore be valuable, and particularly so, when misconceptions concern characteristics that can be observed through everyday interaction.
Neither sustained nor rotating contact consistently changed behaviour towards unfamiliar members of the other community, as measured by willingness to work with them and generosity towards them. Productivity also did not differ significantly between the sustained and rotating partnership groups.
Why Better Relationships May Leave Prejudice Intact
A positive relationship with someone from another community does not necessarily alter how unfamiliar members of that community are perceived. People may regard a trusted colleague as an exception to their existing beliefs, while continuing to apply those beliefs to others. Similarly, correcting factual misconceptions may not change behaviour shaped by social norms, perceived risks or established prejudices. The Barasat findings suggest that stronger interpersonal connections and more accurate beliefs are valuable outcomes, but neither can be treated as evidence of broader behavioural change.
Designing Contact Around the Desired Outcome
These distinctions have practical implications for how public institutions design and evaluate programmes intended to strengthen social cohesion.
Programmes designed to build trust should provide continuity of interaction. Stable partnerships in vocational training, workplace induction, educational activities and community projects can give participants time to assess one another's reliability, develop cooperative routines and establish relationships that may generate lasting social and economic support.
Programmes intended to improve understanding of a wider community require a different design emphasis. Rotating group activities, collaborative projects involving several teams and structured exchanges across communities can expose participants to a wider range of people. Their value will depend on whether these encounters provide credible information relevant to the misconceptions the programme seeks to address. Exposure should be designed around a defined learning objective and assessed against it.
Institutions seeking both outcomes could test combinations of sustained and rotating contact. Participants might work with a continuing partner for some activities and different people for others. Such arrangements could combine the benefits of familiarity and broader exposure, but their effectiveness and implementation costs need to be established through further evaluation.
Attendance, participation and satisfaction indicate whether an intervention has been implemented and received positively; they do not necessarily establish whether it has strengthened social cohesion. Institutions should separately assess the durability of relationships, the accuracy of beliefs about unfamiliar members of other communities, and behaviour towards people participants have not previously met. Where programmes operate in workplaces or productive settings, productivity and other organisational outcomes should also be measured. Distinguishing these outcomes would allow institutions to identify which forms of contact work, for whom and towards which objectives, rather than assuming that bringing people together alone is sufficient.