What is a bottleneck?A 'bottleneck' is a stage of the production chain (a sub-process), that constraints the throughput of the whole process. Its capacity is smaller than the capacity of the up-stream and down-stream sub-processes.Why bottlenecks appear?When a process has no variability (as in bottling lines) there are no bottlenecks. However, in the presence of variability bottlenecks constitute an inevitable fact. It is the nature of the beast!...