Hi,
As a scrum master I am coaching two scrum teams. Each team has a daily scrum board. This morning I participated in the daily stand up of one of the teams. One of the developers moved a task he had worked on the day before, back to the 'todo' column.
After the stand up I made a remark about this. It is my understanding that the direction of tasks on the scrum board is always from left to right. In other words, tasks can't be moved back and should be left in 'doing' if work on it has started.
I am very curious to hear your views on the matter.