③ Hidden Factory Waste: What to Measure Before You Automate
Updated: Sep 27
Season 1 · The Productivity Revolution
By HOSOON CHOI · Korean original published July 5, 2026
A forklift keeps moving. Operators hurry between workstations. The production manager answers another urgent call for materials. From the office window, the factory looks fully occupied. Yet shipments slip, overtime continues, and the next investment request asks for more people or equipment.
The difficult question is what all that activity accomplishes. Some work advances an order. Some protects quality and safety. Some compensates for missing information, unreliable replenishment, or a process that cannot hand work to its successor.
For an overseas company assessing a Korean factory, the distinction matters before choosing a robot or approving capital expenditure. A busy site can conceal an opportunity, but activity alone cannot establish either the cause or the investment case.
Separate the wastes before selecting the remedy
The traditional lean framework identifies seven wastes. Underused employee knowledge and skills are a later eighth category; they do not replace transport or motion. The distinctions below follow the Lean Enterprise Institute's seven-waste framework and its explanation of the eighth waste. The observation questions are practical applications for this article.
Observation lens | A question for the factory floor |
Overproduction | Are batches released earlier or in larger quantities than the next process needs? |
Waiting | What prevents an operator, machine, or order from proceeding? |
Transport | Why does a load visit intermediate storage before its next operation? |
Excess processing | Who uses each repeated entry, approval, or finishing step? |
Excess inventory | Which stocks exceed the buffer justified by demand and replenishment conditions? |
Unnecessary motion | Why must the operator search, reach, or walk to obtain an item? |
Defects and correction | Where was the problem created, and where was it discovered? |
Underused skills — the additional eighth lens | Which recurring problem could operators help resolve if given time and authority? |
Do not treat every activity outside direct production as removable. Safety checks, traceability, and justified quality controls may be essential. Lean itself distinguishes currently unavoidable activities from waste that can be eliminated. Improve how necessary controls operate; do not simply delete them to improve a time chart.
Movement: follow the person and the load separately
An operator walking to locate a component and a forklift taking that component through three storage locations represent different problems. The first may involve workplace organization or inaccurate location data. The second may involve layout, release rules, or an unavailable destination. Buying faster transport can leave the first problem untouched and merely accelerate the second.
Trace one recurring movement from request to delivery. Record its origin, destination, load unit, handling stages, and reason for each stop. Ask whether the destination was ready when transport was requested. A busy forklift may be servicing a sound replenishment plan, or responding to repeated emergencies; the activity count cannot distinguish them.
Waiting: count time without inventing savings
“Only five minutes” is not a useful diagnosis. Identify who waited, what they needed, and what actually released the wait. Material shortage, inspection release, missing instructions, and downstream congestion require different responses.
Consider an illustrative calculation: five operators each experience twenty separate five-minute waits during a day. That totals 500 person-minutes. If all five wait together at each event, however, elapsed waiting time is 100 minutes, not 500. A machine stopping during the same events creates another record of the same disruption, not automatically an additional financial loss.
Those observations do not prove recoverable payroll savings, lost sales, or additional saleable output. Check whether the affected process constrains shipments, whether work is recovered later, and how released capacity could actually be used. Preserve both person-time and process-time measures rather than adding them indiscriminately.
Inventory: ask what the buffer is protecting
Stock can protect service when demand or replenishment varies. The question is which uncertainty justifies each buffer and whether its size remains appropriate. A pallet awaiting quality release is physically present but may be unavailable for production. A growing queue before one operation deserves a different response from a deliberate reserve of a long-lead component.
Compare quantity with status, age, usage, replenishment time, and location accuracy. Work-in-process — partly completed production — should also be tracked by time spent between operations. A pile seen during one walk-through does not establish a persistent bottleneck; check its movement across shifts and product changes.
Overproduction can feed these queues even while local equipment utilization looks excellent. Review batch-release rules and downstream demand before expanding storage. Reducing a buffer without addressing the uncertainty it absorbs can create shortages instead of improvement.
Repetition and rework: establish the purpose and the origin
Paper-to-spreadsheet-to-system entry is an obvious investigation point, but three records may serve different controls. Map the information, its owner, and its users. Then establish which source should be authoritative and which duplicate steps can safely disappear. Digitizing all three copies can preserve the original inconsistency.
For defects, distinguish where the fault originated from where it was detected. Record the product, process, material lot, relevant operating conditions, and subsequent containment or rework. More inspection at the end may reveal problems without preventing their recurrence. Involve the people who handle exceptions daily; their knowledge is often absent from management reports.
Turn a walk-through into a testable observation
A first visit identifies questions. It does not replace representative observation across shifts, product mixes, peak periods, and exceptions. Start with a small log:
Record | Why it matters |
Time, location, product or load, shift | Makes events comparable |
Start, finish, affected people and equipment | Separates elapsed time from resource time |
Observed trigger and release condition | Separates evidence from a suspected cause |
Frequency and downstream effect | Shows recurring impact beyond a busy workstation |
Temporary response, owner, verification | Tests whether the proposed change removes the cause |
Prioritize by recurrence, duration, quality and safety implications, and effect on delivery. One repeated disruption at a critical handover may deserve more attention than several minor inconveniences elsewhere.
For Korea projects, agree what the data means
An overseas headquarters, a Korean plant, and an equipment supplier may use the same word differently. Does “available inventory” include material on quality hold? Does “cycle time” include replenishment and changeovers? Is downtime recorded from the first interruption or from the maintenance call?
Resolve these definitions in a shared Korean–English observation sheet before comparing proposals. Also identify who can approve a process change, who owns interface data, and who will respond when imported equipment stops during the Korean operating shift. Confirm the availability of operating instructions, training, service support, and relevant spare parts with the proposed suppliers.
These are project questions, not assumptions about every Korean factory. They help a foreign team distinguish a local operating constraint from a reporting difference and frame a scope that the Korean site can actually evaluate.
Decide what should be simplified, then what might be automated
First test a simpler location rule, replenishment trigger, release condition, or standard work instruction. Then compare the remaining recurring task with manual improvement, fixed handling equipment, automated guided vehicles (AGVs), or autonomous mobile robots (AMRs), as appropriate.
Load variation, handover conditions, traffic interaction, floor conditions, exception recovery, and maintenance affect feasibility. Safety assessment and validation belong in the project from the outset; automation does not make mixed pedestrian and vehicle traffic safe by itself. Site measurements and qualified technical review are needed before defining equipment or acceptance criteria.
The strongest next step is a clear problem statement: what repeatedly happens, what causes it, what the customer-facing consequence is, and what evidence would demonstrate improvement.
Discuss your Korea automation project with HOSOON CHOI
Planning a manufacturing, robotics, or logistics automation project in Korea? Share the process or route concerned, the load or product, recurring delays or rework, approximate daily volume, and the main site constraints. Overseas headquarters, equipment suppliers, and Korean operating teams can use this as a starting point for a focused discussion.
The next conversation can define the information needed to assess improvement priorities, automation options, supplier comparisons, and a site-specific business case. Detailed engineering, implementation scope, and quantified return on investment require project data and separately agreed follow-up work.
The platform is available in Korean and English. Or contact hci@hosoonchoi.com.
HOSOON CHOI · MBA
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