sorry for writing so many ECS related topics, but as I'm programming, I come over more and more problems...
My architecture has an entity manager and a system manager, the entity manager manages all entities (entities are only ids), and every component has it's component pool which gives the component for the id back.
The system manager has all systems (render system, audio system,...).
Then I have an additional class scene manager, which, for example, creates the scene in the beginning of the game. The scene manager routes all work to the render system, he told the render system to create an entity with the given mesh, on the given position and so on.
And here I have my question, most of the articles say, that the movement system is a system. In my opinion, systems are low level classes, and managers (or how the will ever be named) are high level. The movement system moves my entities, that means, the movement system checks the velocity component and the position component of the entity, and moves the position of the entity by the given velocity, and told the render manager that the entity is moved. That means for me, that the movement system is not a system but a manager (it's high level, because it has nothing to do with the rendering of the entity).
Or should all systems knows the entity manager and the renderer checks all positions of the entities and moves them? But also then, the movement system is high level.
Is the ecs architecture combining high level and low level systems? This really is hard to solve for me, I know, that there is no given ECS way to go, but you have much more knowledge of this pattern I think.