Stigmergy

The word comes from biology, from the Greek stigma for sign and ergon for action, and names indirect communication allowing collective action, as among ants and other social insects. Stigmergy is action which follows signs left in the environment. Marsh developed it as a form of action-based social organization to replace the hierarchy or cooperation used in personality-based structures, after finding that the movements with by far the widest success were action-based rather than personality-based, and beginning to think of them as verbs rather than nouns. The definition's four sentences are four requirements. Collaboration follows an idea rather than a person. Agreement is needed on the goal and on nothing else, which is what makes autonomy over method possible. Communication is through transparency rather than through channels, so the work itself is the message. And secrecy and ownership of ideas are opposed to it outright, since an ant that finds food and leaves no pheromone breaks the system. The ultimate authority stays with the whole society, which can accept or reject work, while workers remain free to create regardless. Two consequences distinguish it from consensus. Nobody needs permission to contribute, and radically innovative ideas almost never receive instant mainstream acceptance, so leaving control to group consensus cripples innovation. Growth produces splintering into nodes rather than expansion, since no one can direct anyone and expansion means more work for the individual.

Pierre-Paul Grasse coined stigmergy in 1959 for termite building, and swarm intelligence and multi-agent systems in computer science derive algorithms from the same principle. Free software development is the most cited human example, with Wikipedia and open source projects analysed as stigmergic. Elinor Ostrom's commons research addresses adjacent coordination questions. Marsh's contribution is to develop it as a deliberate organizing method for movements rather than as a description of emergent behaviour, and to specify the conditions it requires, since the transparency and non-ownership clauses turn an observed pattern into a set of design constraints.