Deliberate strategy relies on senior leaders to set goals and develop plans and strategies to achieve them. Emergent strategy is a strategy that emerges from all over the company, over time, as the environment changes and the organization shifts and adapts to apply its strengths to a changing reality.

Experimentation Is The New Planning | Fast Company 

An analogy for understanding emergence and self-organization: Scounts from an ant colony going out looking for a new nest. One finds a site it likes and recruits another ant to come and look. If the second one makes the same evaluation, it recruits another… and so on. A tipping point comes when enough ant scouts are recruited and the behavior changes. Ants stop recruiting and begin making the move.

via Fast Company reprint from The Connected Company  by Dave Gray and Thomas Vander Wal.