Clone to counter: mapping the flow

What a value stream is

A value stream is every step it takes to get one product to the customer, including the waiting between steps. Not the steps in the procedure manual. The steps that actually happen, in the order they happen, with the time each one takes.

Here is a cannabis value stream for flower, from the first step to the shelf:

1. Cultivation: mothers, clones, veg, flower, harvest call.
2. Post-harvest: harvest, dry, buck, cure, trim, grade, weigh the lot, lab sample, vault hold, release.
3. Packaging and fulfillment: pull the released lot, pack and label, tag, vault, pick the order, manifest, deliver.
4. Retail: receive and accept, back-of-house storage, stock the floor, list on the menu, sell.

Manufacturing sits beside this path. Some flower becomes extract, infused products or pre-rolls, and that product follows its own stream through extraction, post-processing, testing and fill. The method below works the same way for either one.

Notice that every arrow between two areas is a handoff, and every handoff is somebody's customer. That's where this lesson spends most of its time.

Why draw it

Each team in an operation can usually tell you how long its own steps take. Almost nobody can tell you how long the product takes to get through all of them, because the time lives in the gaps between teams and no one owns a gap.

A drawn map fixes that in three ways. It shows the waiting, which no procedure lists. It shows the handoffs, where one team's output sits until the next team is ready. And it gives everyone the same picture, so the argument shifts from "your area is slow" to "this is where the batch sat."

How to map one product

1. Choose one product. One strain and batch, or one SKU, or one order. Not a department and not "everything we make."
2. Walk the whole stream first, then draw from the customer back. Take a quick walk door to door, the way Rother and Shook describe it in Learning to See. Then go back to the customer, who is whoever receives your work next, and work upstream, drawing by hand in pencil. It keeps your attention on what the customer needs, not on what your area happens to do.
3. Write the step, who does it, and what it hands off. One box per step. Use what you see, not what the procedure says. If the procedure and the floor disagree, write down the floor.
4. Write two times for each step. The working time: how long someone actually works on it, or how long it's in a process that has to take that long, like dry and cure. And the waiting time before it: how long the product sat before this step started.
5. Take the times from records first. Tote cards, scale logs, lab dates and the tracking system already hold most of them. Where there's no record, watch it once and write down what you saw.
6. Draw a triangle between steps where product waits, and write how long and how much.
7. Mark each wait. Is it required, like the test hold? Or is it just sitting?

The printable map in the task below has boxes for a handful of steps and a wait between each, so you can do this on one page.

Common mistakes

• Mapping the whole company at once. You'll never finish, and nobody will recognize the result. One product.
• Drawing the procedure, not the floor. The map is only useful if it's what really happens.
• Trusting a system average. Rough numbers are fine for a first pass, but time one real batch yourself. One real batch beats a smoothed number. You can average later.
• Fixing while you map. The rule from Lesson 2 still holds: write it down, keep walking.
• Mapping only your own area. Include the step before and the step after. The biggest waits are often right at your doorstep.

The arithmetic

Once the map is drawn, three numbers tell you what you have.

• Lead time, door to door: from the first step to the last. How long the product takes to get through.
• Working time: the time the product is being worked on, plus time in a process that has to take that long, like dry and cure. Some people count only hands-on time. Pick one way and use it every time you map.
• Waiting time: everything else. Split it into required waiting (the test hold) and other waiting.

The share of lead time that is working time is the part the customer would pay for. In most operations it's smaller than people expect, which is exactly why the map is worth drawing.

Notice what the example doesn't ask you to do. It doesn't ask you to shorten dry and cure, and it doesn't ask you to skip the test hold. It points you at the two days nobody was working on the lot and nothing required it to sit.

Knowledge check

Your task: map one product

1. Choose one batch or order in your area, ideally one that has already finished, so the records exist.
2. Fill in the map with your area's steps, plus one step before it and one after.
3. For each step write who does it, the working time and the waiting time before it. Use records where you can.
4. Mark each wait R (required) or O (other).
5. Add it up: lead time, working time, required waiting, other waiting.
6. Circle the longest O. Write down which handoff it sits at. Don't fix it yet.

Open the printable map

Sources

Where the facts in this lesson come from. Facts last checked October 1, 2026. If you find one that is out of date or wrong, tell me.

• Lean Enterprise Institute: value stream mapping
• Lean Enterprise Institute: Learning to See, Rother and Shook (1999)
• Lean Enterprise Institute lexicon: cycle time and lead time
• 935 CMR 500, adult-use marijuana regulations (effective September 11, 2026): inventory and tracking at 500.105(8)