Informal systems in growing organisations

Ask any leader in a growing organisation what keeps things running, and they'll talk about processes, reporting lines, governance structures. Ask them again after a drink, and you'll get closer to the truth: it runs on Sarah knowing everyone, on the Tuesday catch-up that somehow resolves more than any formal meeting, on the fact that the three people who've been here longest can sense when something's going wrong before any dashboard picks it up.

Every organisation has this layer. It's the informal infrastructure - the knowledge networks, relationship bridges, tacit understanding, and unwritten coordination that keeps things moving. In a smaller organisation, this layer does an extraordinary amount of the heavy lifting. It's fast, it's adaptive, and it's free. Nobody designed it. It just grew.

The challenge is that this infrastructure has a carrying capacity. And growth will find it.

What informal systems do in organisations

Before thinking about what breaks, it's worth appreciating what these systems do well. In most organisations, the informal layer handles things that the formal systems can't - or at least can't do quickly enough.

Knowledge distribution. The formal system says information moves through reports and updates. In practice, the most important knowledge often travels through people who've built relationships across teams. The person who happens to know someone in finance, or the manager who used to work in operations before moving to service delivery. These informal knowledge networks carry context, nuance, and speed that no reporting system can match.

Coordination across boundaries. Org charts create boundaries. Informal relationships bridge them. Two team leads who eat lunch together will coordinate better than two who only interact through a governance framework. That coordination isn't in anyone's job description - it happens because the relationship exists and the proximity makes it easy.

Decision speed. A quick conversation in a corridor can resolve something that would otherwise take a meeting request, a diary clash, and a follow-up email. In smaller organisations, this kind of rapid informal decision-making is a genuine competitive advantage. Things get resolved at the point of need, by the people closest to the problem.

Cultural transmission. New people learn how things really work not from the induction pack, but from watching, listening, and absorbing. The unwritten norms - how much autonomy people have, what good looks like here, how mistakes are handled - transfer through proximity and relationship. In a smaller team, this happens almost without anyone noticing.

Early warning. The experienced team member who notices something is off before any metric moves. The manager who senses tension between two teams by reading the room. These human signals travel through informal channels and often arrive faster than formal reporting.

None of this is accidental or unprofessional. It's how organisations work. The question is what happens to all of it when the organisation gets bigger.

Why growth puts informal systems under pressure

The informal infrastructure depends on a set of conditions that growth directly changes.

Proximity shrinks. The corridor conversation requires a corridor - or at least enough shared physical or virtual space that informal contact happens naturally. As organisations grow, teams spread across floors, buildings, or locations. The casual encounters that powered informal coordination become less frequent and eventually stop.

Familiarity dilutes. When everyone knows everyone, informal knowledge networks work beautifully. When the organisation grows past the point where that's possible - and research suggests this happens somewhere between 50 and 150 people - the networks start to fragment. New people don't have the relationships to bridge gaps. Long-standing staff still carry the knowledge, but it reaches fewer people.

Trust becomes localised. In a small team, trust extends across the whole group. In a larger organisation, trust tends to concentrate within teams and thin out between them. The cross-boundary coordination that used to happen informally now needs something more deliberate to replace it.

Tacit knowledge concentrates. The three people who know how everything works become a bottleneck rather than an asset. Their knowledge doesn't spread at the rate the organisation is growing. Decisions start routing through them, not because the governance requires it, but because nobody else has the context to make the call.

Cultural transmission weakens. When the ratio of experienced people to new people shifts, the culture can no longer transmit itself through immersion alone. New hires pick up the formal version - the values on the wall, the onboarding materials - but the lived experience of the culture reaches them in a thinner, more diluted form.

None of these things happen dramatically. There's no single moment when the informal systems fail. They erode gradually - and because they were never visible in the first place, the erosion often isn't noticed until the symptoms show up somewhere else. Decisions slow down. Information doesn't reach the right people. Quality varies between teams. People describe the culture as "different now" without being able to pinpoint why.

The trap of replacing informal with formal

The instinct when informal systems start to struggle is to formalise. More meetings. More reporting. More documented processes. Clearer escalation routes. This makes sense on paper - if the informal system isn't carrying the load any more, build a formal one that can.

The risk is that formal systems designed as direct replacements for informal ones rarely work the same way. A weekly cross-team meeting doesn't replicate the spontaneous coordination that happened when those teams shared a kitchen. A knowledge management system doesn't replicate the contextual understanding that came from a ten-year relationship with a colleague. A new reporting line doesn't recreate the trust that made informal decision-making possible.

This isn't an argument against formal systems - they're necessary, and a growing organisation genuinely needs operational infrastructure it didn't need before. It's an argument for understanding what the informal systems were doing before designing what replaces them. The replacement doesn't need to be informal. It does need to do the same job.

Designing new connective tissue for scale

What works is thinking about it as connective tissue rather than replacement systems. The informal infrastructure connected people, knowledge, and decisions across the organisation. Whatever replaces it needs to do the same - at the new size, in ways that don't depend on proximity, familiarity, or relationships that can't scale.

Some of the most effective approaches we see in scaling organisations:

Deliberate knowledge circulation. Not a knowledge management system (those tend to become repositories nobody visits), but deliberate practices that move knowledge between teams. Secondments. Cross-team problem-solving. Rotation of people through different parts of the organisation. The knowledge moves because the people move - which is closer to how the informal system worked in the first place.

Designed encounters. The corridor conversation was powerful because it was low-friction and happened regularly. At scale, the equivalent has to be designed - but it doesn't have to feel designed. Shared spaces (physical or virtual) where cross-team interaction happens naturally. Regular forums that are structured enough to be useful but informal enough that people actually talk. The goal is recreating the conditions for connection, not the connection itself.

Distributed decision-making. If decisions are slowing down because informal authority has concentrated in a few people, the answer isn't more governance. It's deliberately distributing the context and authority that those people hold so that decisions can happen closer to the work. This requires investing in people's understanding of the bigger picture - not just their own team's objectives, but how those objectives connect to the organisation's design as a whole.

Culture as practice, not message. If cultural transmission used to happen through proximity, it needs a new vehicle at scale. This isn't about more communications or another values refresh. It's about embedding the culture in the way work happens - in how teams are structured, how decisions are made, how people are developed, how success is recognised. The culture becomes something people experience through the system, not something they're told about.

Visible information architecture. The informal system moved information through relationships. At scale, the organisation needs to think deliberately about how information reaches the people who need it - what flows where, at what speed, with what context. This isn't reporting (that's upward-facing). This is the lateral and downward flow that used to happen through informal networks.

Scaling the organisation, not just the operations

The distinction matters. Scaling operations - the processes, systems, and structures - is necessary work. But scaling the organisation means evolving the whole system, including the invisible infrastructure that holds it together.

The informal systems that worked at the smaller size were doing something important. They were connecting people across boundaries, distributing knowledge at speed, enabling fast decisions, and transmitting culture through lived experience. Growth changes the conditions those systems depend on. Scaling well means understanding what they were doing and deliberately designing new ways to do it at the new size.

The organisational maturity model is a useful tool for seeing where this connective tissue is strong and where it's thin. Not as a checklist, but as a way of mapping the organisation's real operating conditions against the size it's becoming. The places where the formal systems are strong but the connections between them are weak - those are usually where the informal infrastructure used to do the work that nothing has replaced yet.

For mission-driven organisations - housing associations, charities, social enterprises - the informal systems often carry something especially valuable: the organisational identity. The sense of purpose that drew people here. The way things are done that reflects what the organisation stands for. Protecting that through growth isn't sentimental. It's strategic. Because the organisation's mission depends on a culture that has to be deliberately scaled alongside everything else.