The most common mistake people make when tackling process improvement is applying random band-aid solutions to fix symptoms of problems instead of the root cause.
A more effective approach is the 5-step improvement cycle: Define, Measure, Analyze, Improve, Control/Continue to Improve. This is often referred by its acronym DMAIC (pronounced dee-may-ic).
An improvement event (or kaizen) requires an improvement team to dedicate a minimum of three to five days to identify improvement solutions after which solutions are implemented, tested and continuously improved over time. The team is led by a facilitator who can be brought in from the outside or developed internally through certificate training.