At present, we have 4 or 5 different mechanisms by which we facilitate communication between different parts of the system (e.g. between the reactors). This results in:

1. Difficulty in testing those components independently
2. Difficulty in reasoning about the operation of different parts of the system
3. Non-deterministic tests that are, because they are non-deterministic, of dubious value; and they slow down development effort

We should converge on a single, much simpler approach to communication between different parts of the system that need to operate concurrently and communicate with each other.

• Evaluate some options/alternatives for internal messaging approaches
  • RFC 104: Internal messaging using the actor model #1092
  • RFC 107: Internal signalling using event observers #1164
• Define new internal messaging approach in ADR
• Specify next steps after ADR has been developed