A standardized work combination table is a one-page time study that charts an operator's manual time, machine (automatic) time, and walking time for each work element against the takt line. It shows how human and machine work interlock across one cycle, exposing operator waiting, overburden, and whether the job fits inside takt.
Of the three documents that make up standardized work, the combination table is the analytical one, the sheet where you actually see whether a job is balanced or broken. It is not a procedure and it is not a layout. It is a timeline. On it, every second an operator spends working, walking, or waiting is drawn against the pace the customer demands, so a supervisor can look once and know if the operator is overloaded, idle, or riding right at takt. It is one of the most practical tools in lean manufacturing and the natural next step after you understand standard work as a whole.
What Is a Standardized Work Combination Table?
The combination table plans the work of one operator through one complete cycle, and it is built for manual, repetitive work that repeats identically for every part. Down the left it lists the work elements in sequence, load, cycle, unload, inspect, walk to next machine. Across the top runs time. For each element it draws a bar in the operator's timeline showing three distinct things: manual time (the operator's hands-on work), automatic time (the machine running unattended after the operator walks away), and walking time (the operator moving between stations). A vertical line marks takt time. The finished chart is a picture of one cycle in which you can see, second by second, what the operator is doing and what the machine is doing at the same moment.
The reason to separate manual, auto, and walk time is that they behave differently. Manual time is the operator actually adding value. Automatic time is free labor, the machine works while the operator is elsewhere, but only if the operator is doing something useful during it. Walking time is pure waste you want to shrink. Splitting them lets you see the overlap that matters most: an operator who loads a machine, walks away while it auto-cycles, and tends a second machine is running lean; one who stands and watches the machine cycle is the balancing opportunity the table is designed to catch.
What Are the Three Standardized Work Documents?
Standardized work at Toyota is recorded on three shop-floor forms, developed in sequence, and the combination table is the middle one. Skipping straight to it without the others is a common mistake, the combination table needs the capacity numbers underneath it to be meaningful.
| Document | What it shows | Built |
|---|---|---|
| Process capacity sheet | The capacity of each machine, including cycle times and tool-change intervals, to find the bottleneck | First |
| Standardized work combination table | How manual, auto, and walk time combine against takt for one operator's cycle | Second |
| Standardized work chart | The floor layout: walk path, machine positions, quality checks, and SWIP locations | Third |
The order is not arbitrary. You cannot chart how the operator's time combines until you know each machine's true cycle time, which is what the process capacity sheet establishes. And you cannot draw a sensible walk path on the work chart until the combination table has told you which machines the operator tends and in what sequence. The combination table also depends on standard work-in-process being set, because how many pieces sit in the cell affects whether the operator waits. The three forms are a system; the combination table is where the timing lives.
How Do You Fill In a Combination Table?
You fill in a combination table from direct observation at the station, timing real cycles, not from a routing sheet or an estimate. The steps below produce a table you can actually balance from.
- Establish takt time first. Compute takt from real demand and available time, and draw it as the vertical line the whole cycle must fit inside. Without takt the table has no reference and balances against nothing.
- Break the job into work elements. List them in the exact order the operator performs them: load, start, walk, inspect, pack. Elements should be small enough to time cleanly but not so granular the table becomes unreadable.
- Time each element's manual, auto, and walk portions separately. Observe several cycles and record the manual time, the machine's automatic run time, and the walking time as three distinct values. Use repeatable, low times, not the worst case, but be honest about what actually happens.
- Draw each element on the timeline in sequence. Plot manual time as a solid bar, auto time as an open bar continuing from it, and walk time in its own color. Start each element where the previous one ended so the timeline reflects the real cycle.
- Show the overlap between operator and machine. Where the operator walks away and tends another machine while the first auto-cycles, draw those concurrently. This overlap is the multi-process handling the table exists to reveal.
- Compare the total cycle to the takt line. If the operator's combined manual and walk time runs past takt, the job is overburdened. If it ends well short with the operator idle during auto time, there is capacity to rebalance.
- Rebalance and redraw. Move elements between operators, cut walking, or assign a second machine during auto time, then redraw the table and confirm the new cycle fits under takt with the least idle time.
How Does the Combination Table Expose Overburden and Waiting?
By making both impossible to hide. Overburden, muri in lean terms, shows up as a bar that crosses the takt line: the operator physically cannot finish the cycle in the time the customer allows, and no amount of urging changes that. Waiting shows up as a gap: the operator's timeline goes quiet while a machine auto-cycles, meaning you are paying for labor that is standing still. Both are invisible in a written procedure and obvious on a combination table. That is the entire value of drawing time instead of describing steps.
The table also protects against the quiet drift toward overburden that happens when demand rises. When takt tightens because the customer wants more, the takt line on the table moves left, and any element that now crosses it is a job you have just overloaded without realizing it. Rather than pushing operators to somehow go faster, the table forces the honest conversation: the work has to be rebalanced, an element removed, or the process changed, because the old cycle no longer fits the new pace. It turns a vague sense that the line is struggling into a specific bar you can point at.
How Do You Use the Table to Balance Work?
The combination table is the input to line balancing and to multi-machine assignment. Once you can see each operator's real loaded time against takt, you redistribute elements so every operator sits just under takt with minimal idle time, rather than one person drowning while another watches a machine. The classic move it enables is multi-process handling: because the table shows exactly when a machine runs unattended, you can assign the operator a second or third machine to tend during that automatic time, converting idle watching into value-adding work. Done across a cell, this is how a job that "needed" four operators gets balanced to three without anyone working harder, the operators simply stop waiting. Then you re-cut cycle time redraw the table, and lock the new balance into the standard so it holds.
By the Numbers
The standardized work combination table is one of the three core documents of standardized work defined in the Toyota Production System, alongside the standardized work chart and the process capacity sheet (Lean Enterprise Institute, Standardized Work; Toyota Motor Corporation, Toyota Production System). Its specific job is timing: it is a time study that reveals operator waiting time and opportunities for multi-process handling by charting manual, automatic, and walking time within takt. That focus is why it is drawn to a time scale rather than written as steps, the value is entirely in seeing where seconds go. For the full picture of how it sits among the standard work elements, see standard work and for the physical layout it feeds, a value stream map gives the wider door-to-door view.
Where the Combination Table Meets the Plant Floor
A combination table is a snapshot: one operator, one cycle, timed by one person with a stopwatch on one day. The trouble is that real cycles vary shift to shift as mixes, staffing, and machine behavior change, so a table drawn in January can quietly stop matching reality by March. Harmony captures what actually happens at each station over time, real manual and machine cycle times, real waiting, so the balance you designed on paper can be checked against how the cell truly runs, continuously, rather than re-timed by hand every quarter. That turns the combination table from a one-time study into a living standard, the same way SWIP only holds when the real WIP is visible. See it on a running line in the CLS case study or the platform overview.