Which of the following is a key characteristic of a pull system?
Select one answer.
Why your service team needs a pull system
If your organization relies on forecasts and schedules to push work through departments, you likely experience bottlenecks, rework, and frustrated staff. A pull system — where downstream demand signals trigger upstream work — can solve these problems in any environment, not just factories.
What is a pull system?
A pull system is a Lean production control method where work is only released when a downstream process signals a need. This contrasts with a push system, where work is produced according to a forecast or schedule regardless of actual demand. The goal is to limit work-in-progress (WIP) and eliminate overproduction — one of the seven wastes of Lean.
According to the Lean Enterprise Institute, pull production "strives to eliminate overproduction and is one of the three major components of a complete just-in-time production system." In a pull system, nothing is produced by the upstream supplier process until the downstream customer process signals a need (Lean Enterprise Institute).
Pull systems beyond manufacturing
Pull principles apply directly to service and administrative workflows. Common non-manufacturing examples include:
- Healthcare: Emergency departments use pull signals to move patients from triage to treatment only when a bed and nurse are available, reducing hallway boarding.
- Customer support: Tickets are pulled from a queue only when an agent has capacity, preventing work from piling up.
- Loan processing: A loan application moves to underwriting only when the underwriter signals readiness, reducing rework and handoff delays.
- Software development: Kanban boards limit WIP per column, so developers pull new tasks only when they complete current work.
As Expeditor Systems notes, "Just as with a pull approach to manufacturing, pull-based healthcare systems help things flow more smoothly — with no bottlenecks, lags, or gaps" (Expeditor Systems).
How to implement a pull system in a service environment
Follow these five steps to design and deploy a pull system in your non-manufacturing operation:
1. Map your current value stream
Document every step from request to delivery. Identify where work piles up, where approvals cause delays, and where handoffs occur. This baseline reveals the natural pull points.
2. Identify the signal mechanism
Choose a visual or electronic signal that downstream workers use to request work. Common signals include:
- Kanban cards (physical or digital)
- Color-coded bins or folders
- Electronic queue limits in a workflow tool
- Takt-time boards showing actual vs. planned output
3. Set explicit WIP limits
Define the maximum number of items allowed at each step. For example, limit the "in review" column to five items. When the limit is reached, upstream work stops until downstream capacity opens.
4. Train teams on the new discipline
Pull systems fail when staff revert to pushing work to look busy. Explain that idle time at a workstation is not waste — it signals that downstream capacity is full and prevents overburden.
5. Start small and iterate
Pilot the pull system with one value stream or department. Measure cycle time, WIP levels, and throughput before and after. Adjust signal types and WIP limits based on real data.
Common pitfalls to avoid
- Setting WIP limits too high: Limits should be tight enough to expose bottlenecks. Start with a limit of one or two items per step.
- Ignoring variation in demand: Service environments often have unpredictable demand. Use a supermarket pull system with small buffers at each step to absorb variation.
- Skipping visual management: Without visible signals, teams cannot see when to pull or stop. Use physical boards or digital dashboards that everyone can see.
Quiz: Test your understanding
Which of the following is a key characteristic of a pull system?
- A) Work is produced based on a forecast or schedule
- B) Work is released only when a downstream process signals a need
- C) Inventory is built up to ensure availability
Correct answer: B
How the Featured Expert Can Help
Windy Hill Partners helps organizations break the cycle of operational chaos by applying Lean Six Sigma tools — including pull systems — to reduce costs and cut errors. With over 20 years of process improvement experience and more than $20 million in documented financial impact across six industries, Bob Buckwalter, CSSBB, PMP, MBA, equips your team to sustain improvements long after the engagement ends. Visit Windy Hill Partners to learn more.