Takt Time and Matching Demand: A Lean Production Story
Takt time is the rate at which a product or service must be completed in order to meet customer demand. It is calculated as: available production time divided by customer demand rate. If a workshop has 420 minutes of available production time per shift and must complete 60 units per shift, the takt time is 7 minutes per unit. Every process step in the production system should be designed to operate at or below the takt time.
Takt time is not a target speed for individual operators; it is a design constraint for the production system. Understanding this distinction is what separates teams that use takt time effectively from teams that use it as a performance pressure tool. The following scenario illustrates the difference.
The Scenario: A Health Authority Supply Processing Centre
A health authority's central supply processing centre in British Columbia processes surgical instrument trays. In 2021, the centre operated with variable staffing based on surgical schedules. The result was predictable: when surgical volumes were high, trays backed up; when they were low, staff were idle. In early 2022, with elective surgery volumes recovering from pandemic-era delays and the centre facing a 28-percent backlog of overdue trays, a Lean improvement team was brought in.
What the Team Found
The team calculated the takt time: the centre had 480 minutes of available processing time per shift, and the surgical schedule required 96 tray completions per shift, giving a takt time of 5 minutes per tray. Cycle time analysis showed that three of the eight processing stations had cycle times exceeding 8 minutes, while two stations had cycle times of less than 2 minutes. The longest station -- the inspection and documentation step -- was running at 11 minutes per tray and was the system constraint.
What Changed and What the Lessons Were
Rebalancing, not speeding up. The team's first instinct was to increase throughput at the inspection station by adding a second inspector. This would have increased cost and complexity without addressing the root cause, which was that the documentation step required looking up information from multiple systems. The improvement was to consolidate the documentation interface, reducing the cycle time at the inspection station from 11 minutes to 5.5 minutes -- below takt.
Takt time revealed where to look. Before the takt time analysis, improvement efforts had been unfocused. After the analysis, the team knew exactly which station was constraining throughput and could apply focused improvement resources.
Staffing to takt, not to schedule. The previous staffing model had scheduled fixed crews regardless of tray volumes. The new model staffed each station to the takt time, adjusting crew size as the surgical schedule changed. This reduced idle time by 34 percent in the first month.
In 2022, supply chain and labour pressures make takt time more valuable, not less. When labour is constrained, the cost of idle time at underloaded stations and bottleneck time at overloaded stations is amplified. Takt time analysis identifies where to apply scarce resources for maximum throughput impact.
XNM applies Lean process design principles -- including takt time analysis and flow balancing -- in public-sector and capital-project environments. Reach out to XNM's strategic advisory team to discuss Lean process improvement for your operation.