The card wall is the primary organizing method for keeping a project moving.
Ensure that your process is respecting pull signals, rather than push signals.
Defining workflows is a time consuming effort that requires full participation. It is more than worthwhile.
Because Kanban limits work in progress, a bottleneck can become depleted, ceasing work distribution. By inserting a buffer, the flow can be better managed.
Once a team is fully implemented, Kanban will give them a feel for the flow and pace of their development cycle. Then they can reliably forecast how long work will take to complete.
When WIP shows growth, there is a bottleneck and a buffer needs to be constructed.