Dear @Laurent_Auneau
At least according my personal experience and I am open to other points of view:
Nevertheless the amount of tasks, they are always assigned to a project, a team and a task owner.
Depending on priorities of the project, available resources of the team / task owner the task priority needs to be adjusted. Between “waiting” and “in progress” I have learned to have an “triage” zone, a basked of tasks ( with limited amount of tasks) that can be taken from, things I learned from Klaus Leopold’s “Practical Kanban”
Concerning the tasks, next to that they are assigned to a project…
Tasks have mostly dependencies as you can see a sample in this post and when these dependencies are well settled, it shouldn’t be that big challenge to keep the workflow going.by the project owner.
Very curious to learn from the input of others, mine is coming mostly from the production of garments and cosmetics and I know that the IT world is much more advanced.