Trunk-based development

Eric Evans, the inventor of DDD, talks about how continuous integration (CI) helps preserve the sanctity of the domain model within a bounded context. When more than one person works in the same bounded context, it tends to fragment. Obviously, the bigger the team, the higher the likelihood of this problem occurring. Even a team as small as three or four people can encounter serious issues. We have also seen that beyond a point, there may be diminishing returns if we try to break the system into extremely fine-grained bounded contexts.

This makes it very important to institute a process of merging/integrating all code and other implementation artifacts frequently, aided by automated tests to flag such fragmentation. In addition, this allows the team to apply the ubiquitous language relentlessly, each time refining the domain model to represent the problem more accurately. In other words, it is critical to practice continuous integration. Many teams make use...