There are two types of process bottlenecks.
Short-Term Bottlenecks – These bottlenecks result from unforeseen events like machine breakdown, power outages, materials shortages, etc. They’re not always avoidable but manageable.
Long-Term Bottlenecks – These bottlenecks are usually a result of poor planning or execution. These types of bottlenecks typically require the use of lean methodologies and tools.