Seven Out of Eight Isn’t Ready: The Eight Flows Behind Every Task
- Jun 9
- 5 min read
ISSUE 7 · JUNE 11, 2026
Your crew finishes sequence one ahead of schedule and rolls toward sequence two — fully manned, ready to keep moving. Then they stop. The material for the next zone isn’t on site, and it won’t be for another week. Not because anyone dropped the ball this morning, but because the submittal that releases that material stalled six weeks ago and quietly ate the fabrication lead time. Nobody on site this week did a thing wrong. The day was lost a month and a half before it started.
That’s the thing about a construction task: effort isn’t enough. A task can only run when everything it needs is present at the same time — and “everything” is a longer list than most schedules admit. Lauri Koskela mapped it out in his 1999 paper Management of Production in Construction: A Theoretical View. He identified seven preconditions that every assignment depends on: the information (drawings, specs, a clear method), the materials, the equipment, the labor, the space to work in, the prerequisite work finished ahead of you, and the external conditions — weather, permits, inspections, anything outside your four walls. The field has since added an eighth that nobody argues with: safe conditions — the area has to be safe to work in before it counts as ready.
Call them the eight flows. The point is simple and unforgiving: a task is only sound — only truly ready to release to a crew — when all eight are flowing to it. Seven out of eight isn’t 87% ready. It’s not ready. Miss the inspection and the other seven flows just stand around with the crew.
Glenn Ballard and Greg Howell built the Last Planner System around exactly this. In Ballard’s 2000 dissertation and their 2003 paper An Update on Last Planner, the move that makes the whole system work is make-ready: as tasks come into your lookahead window, you screen each one against all eight flows and ask, plainly, “What’s missing?” Every gap becomes a constraint with a name and a date — RFI 214 answered by Thursday, crane available the 18th, area released after MEP rough-in. You work the list down so that by the time a task hits the weekly work plan, every flow is confirmed. Only sound assignments get promised. That discipline is why Percent Plan Complete climbs: you stopped promising work that was never actually ready.
Here’s what changes when you internalize it. Most schedule slips don’t come from crews working too slow. They come from tasks being released before they were sound — and then the crew makes do. They start without the right material, improvise around the missing detail, work the half of the area that’s open. It feels like progress. It’s the most expensive kind of waste there is, because it generates rework you’ll pay for twice. The eight flows give you a checklist against that instinct. Before you turn a crew loose, you can name all eight and confirm each one — or you hold the task and clear the constraint first.
So the real job of the PM isn’t pushing people to go faster. It’s making sure all eight flows arrive before the crew does. Run a constraint log against your three-to-six-week lookahead. Screen every task against the eight. Assign each gap an owner and a need-by date. Walk the list in your weekly coordination meeting and clear it. The crews that run smooth aren’t the ones working hardest — they’re the ones who never get released into a task that was missing a flow.
Something to consider. A constraint log lives or dies on whether anyone keeps it current, and across a busy lookahead that’s a lot of small items to track. This is where AI earns its keep. Point it at your RFI log, submittal register, and lookahead schedule and have it flag which upcoming tasks are still missing a flow — an unanswered RFI here, a submittal not yet approved there, a long-lead material that won’t land in time. It can roll a scattered constraint log into one readout: these tasks are sound, these are blocked, here’s what’s blocking them. What AI can’t do is walk the floor and confirm the area’s actually safe and open, or chase down the sub who owes you an answer. It surfaces the gaps faster; closing them is still the job.
Steel Market Snapshot
Early June 2026 — HRC clears $1,105 as mills hold pricing power and a new tariff order reshapes the import math.
HOT-ROLLED COIL $1,105 /ton ▲ Up $10/ton (wk of Jun 2) · tight spot | PLATE ~$1,217 /ton ▲ SSAB +$40/ton · $10/ton fuel held |
WIDE-FLANGE BEAMS $1,100–1,400 /ton service center · firm scrap | REBAR +$60 /ton ▲ Spring hikes · ~$40/ton above HRC |
Nucor pushed hot-rolled spot up another $10 the week of June 2, mill utilization is holding above 81%, and a fresh Section 232 proclamation — effective today — restructures the duties on derivative steel products.
Hot-rolled coil sits at roughly $1,105/ton after Nucor’s June 2 spot increase, with market averages near $1,109/ton. Prices have climbed in $5–15/ton weekly steps since late January on tight supply, thin service-center inventories, and reduced imports. Lead times remain stretched and spot tons scarce.
Plate is holding firm near $1,217/ton on average. SSAB hiked plate base prices $40/ton in mid-May; Nucor held its plate base but kept a $10/ton fuel surcharge in place for June shipments.
Wide-flange beams are running roughly $1,100–1,400/ton through service centers (lower at the mill), supported by firm scrap and the same tight long-products market.
Rebar continues to climb — domestic producers pushed tags up about $60/ton this spring, keeping rebar around $40/ton above HRC.
What to watch: Mill capability utilization hit 81.1% the week ending May 30 (up from 76.6% a year ago), keeping domestic pricing power intact. The bigger story is policy: a June 1 proclamation, effective June 8, keeps the 50% Section 232 duty on full customs value for steel-intensive articles, sets a 25% rate on most derivative products, and — new — exempts products that are 15% or less steel by content. For precon teams, that’s a reason to re-check landed costs on mixed-material and derivative packages before you lock buyouts. Lock domestic pricing where the schedule allows and plan for lead times to stretch, not soften. For live data, visit our Market Informer page.
Sources & Further Reading
1. Koskela, Lauri. “Management of Production in Construction: A Theoretical View.” Proceedings of IGLC-7, University of California, Berkeley, 1999. faculty.ce.berkeley.edu
2. Ballard, Herman Glenn. The Last Planner System of Production Control. PhD dissertation, University of Birmingham, 2000. leanconstruction.org.uk
3. Ballard, Glenn, and Greg Howell. “An Update on Last Planner.” Proceedings of IGLC-11, 2003. iglc.net
4. Pasquire, Christine. “The 8th Flow — Common Understanding.” Proceedings of IGLC-20, 2012. leanconstruction.org.uk
5. IndexBox. “Nucor Increases Hot-Rolled Coil Price to $1,105/Ton as of June 2026.” June 2026. indexbox.io
6. GMK Center. “Nucor has raised the price of hot-rolled coil to $1,105 per ton.” June 2026. gmk.center
7. Steel Market Update. “SSAB hikes plate prices by $40/ton, Nucor maintains current pricing.” May 11, 2026. steelmarketupdate.com
8. Steel Market Update. “Nucor Plate Group keeps fuel surcharge at $10/ton for June.” May 18, 2026. steelmarketupdate.com
9. American Iron and Steel Institute. “Raw Steel Production — Week Ending May 30, 2026.” 2026. steel.org
10. GMK Center. “American rebar producers have raised prices by $60/t.” 2026. gmk.center
11. The White House. “Further Adjusting the Tariff Regimes for Imports of Aluminum, Steel, and Copper into the United States.” June 1, 2026. whitehouse.gov
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