Last Planner in Construction | Track the Right Metrics (PPC + Learning Loop)

Track the Right Metrics: Percent Plan Complete Plus the Learning Loop

Here’s a problem most projects don’t realize they have: they’re tracking percent plan complete religiously, analyzing root causes every week, and still not making real progress. The meetings happen. The data gets collected. The charts get updated. And the project keeps slipping. Why? Because percent plan complete is a lagging indicator. It tells you how well you did after the fact. It doesn’t help you stay ahead of the problems.

This isn’t about abandoning PPC. It’s about adding the leading indicators that actually create flow before the work breaks down.

The Pain of Lagging Indicators That Don’t Drive Change

Let me describe what happens on most projects. The team runs their weekly work plan. They track every activity. At the end of the week, they calculate percent plan complete. Let’s say they got eight out of ten activities done. That’s eighty percent. The superintendent asks why the two activities didn’t get completed. The foreman explains. The team does root cause analysis. They ask why five times. They identify the problem. And then nothing changes.

Next week, different activities fail. Same root cause discussion. Same analysis. Same promise to fix it. And the cycle repeats. The team is doing everything the Last Planner System asks them to do. They’re tracking PPC. They’re doing the learning loop. But the job site isn’t improving because PPC only tells them what already happened. It doesn’t help them see what’s coming or prevent the next failure.

I will tell you, in very good Last Planner implementations, client implementations or my implementations, I have actually never seen anyone effectively use this lagging indicator to make changes that affect the good of the job site. And that actually has been admitted by Last Planner inventors and practitioners as well. It’s a good idea, but it tells us how well we did after the fact.

What Percent Plan Complete Actually Measures

Let me explain how PPC works so we’re clear on what it measures and what it doesn’t. The weekly work plan shows planned activities for the week, Monday through Friday. If it’s done properly, it also shows key handoffs and it shows the commitments made by the trade partner or promises. The best practice is if we’re doing the afternoon foreman huddle today, we can go through and say, “Did we get that activity?” And I would checkmark that and say, “Yep, that one’s done.” And if it’s not done, I can mark it with a red X and we can start to problem solve.

Now the bottom line is, either in the day or the week, let’s just make this easy. Let’s say that you had ten activities or ten promises and you only got eight. What you do is eight divided by ten, and that equals eighty percent. You have an eighty percent plan complete.

Now in Last Planner thinking, and it does make sense, there’s concepts that we get from Lean in Japan that talk about eighty percent being probably the ideal target. Like for instance in Japan they say eat until you’re eighty percent full. I understand the precedent. But the bottom line is you can actually target one hundred percent for your PPC when you’re using Takt. When you’re using CPM, eighty percent is probably the ideal. But I want to track one hundred because Takt planning is packaged properly. In CPM, they target eighty percent because they feel if you have one hundred that you’re sandbagging. But in the Takt system, you should be able to hit one hundred.

The bottom line is this metric is here to indicate whether or not the Last Planner team is hitting or delivering on their promises. Your PPC, your percent plan complete, your percent promises complete, is a way to track whether or not you’re actually executing on your promises.

Why PPC Doesn’t Work Well With CPM

Here’s what the data shows. In CPM, if you do it straight from CPM, you’ll only hit fifteen to forty-five percent PPC. If you do CPM and Last Planner and you’re really on your game and you have a really healthy, meaning conservative, milestone, then you can get up to above eighty percent. And projects that are above eighty percent are historically on budget and on time. Projects that are below eighty percent are historically fifteen percent below the actual desired target, meaning that they’re not on budget and not on time.

This is percent plan complete. You can use percent promises complete. But this is a lagging indicator. When you actually go through and you find this problem, the idea is to dig deeper. Ask why five times or seven times or nine and get to the root cause. Find the reason for the variance and fix it.

But here’s the problem: you’re fixing what already broke. You’re not preventing the next break. And that’s why you need leading indicators that help you see problems before they hit the crew.

The Three Leading KPIs That Actually Matter

There are a couple of other KPIs that are very important, and I’m going to talk about them right now. The perfect handoff percentage is one. The remaining buffer ratio is another. And the roadblock removal average is another. And a shout out to Spencer Easton and Adam Hoots for helping me a long time ago create these. This was a joint effort, but these are absolutely genius.

Perfect Handoff Percentage (PHP)

The perfect handoff percentage says we’re not going to track every activity, but we are going to track the key handoffs. See, if we’re handing off from zone to zone, we know that we’re in flow. So, this one right here is tracking the number of handoffs that we had by the number of handoffs that we actually accomplished. And we do want to be above eighty percent for that.

Now, you actually can, as counterintuitive as it seems, have a good percent plan complete but have a bad perfect handoff percentage. Your perfect handoff percentage is tracking more ahead of the activities that actually matter. And you might say, “Isn’t the perfect handoff percentage a lagging indicator?” It is still technically a lagging indicator, but it’s tracking the most important things. So, it brings it up on the list of relevance.

Here’s why this matters. You can complete eight out of ten activities and hit eighty percent PPC, but if the two activities you missed were critical handoffs, your flow just broke. The train stopped. The next trade is waiting. And PPC didn’t catch it because it treats all activities equally. PHP focuses on what actually drives rhythm.

Roadblock Removal Average (Leading Indicator)

Your roadblock removal average is the best leading indicator we have. The best way for me to put it is to say, by the time you found a roadblock in your lookahead planning to the time that you resolved it, you can either track one or two things. You can track the average time it takes to remove, or my preference is the average time between resolution and impact of the work.

And so, what you would do: if you have a negative number, that’s bad. If you have zero, that means you’re firefighting. And if you have a positive number, that means that you are removing roadblocks out ahead. And that is a crucial KPI, a leading indicator that will create flow and make work ready.

This is the metric that tells you whether your make-ready system is working. Are you clearing the path ahead of the train, or are you discovering problems when the crew shows up? If your roadblock removal average is positive, you’re leading the project. If it’s zero or negative, you’re chasing the project.

Remaining Buffer Ratio (Leading Indicator)

The remaining buffer ratio will basically say this: if you have a phase of work and you have buffers because you’ve used Takt properly, the question is how many buffers do you need versus how many do you still have? And if you do this ratio, you should be above one. You can track that visually or you can just track that with this number. So, if you have anything over one, like one point one, you’re good. If you have anything less than one, like zero point nine five, that means you don’t have enough buffers remaining according to how many you need to finish the phase.

This metric tells you whether you’re burning through your safety margin or protecting it. Buffers exist to absorb variation. If you’re consuming buffers faster than planned, your system is under stress and you need to adjust before you run out of protection.

Why These Three KPIs Work Together

The bottom line is percent plan complete is great if you actually use it and base it on Takt. You can actually get some traction there. You will not be able to use PPC well with CPM because you’re not tracking anything stable. But I would say a higher-level lagging indicator is your perfect handoff percentage because you’re tracking critical handoffs. And then your leading indicators are how well are you tracking according to your buffers and how well are you removing roadblocks.

These are three additional KPIs which will actually matter to your production plan and are very easy to track. As we get scheduling software up and running and include AI, it will track automatically and it will give us more data.

Here’s how they work together:

• Perfect handoff percentage tells you if flow is happening zone to zone
• Roadblock removal average tells you if you’re clearing the path ahead of the train
• Remaining buffer ratio tells you if you’re protecting your safety margin or burning through it
• Percent plan complete tells you if you executed the weekly commitments

One is a high-level lagging indicator. Three are leading or near-leading indicators. Together, they give you visibility into whether the system is working before the project crashes.

Connecting This to Takt Steering and Control

You can learn how to do this and track these KPIs in the book Takt Steering and Control. And you’ll find out more of why it’s necessary in the book The 10 Improvements to the Last Planner System. These metrics are built into the Takt Production System because they track the things that actually create flow: handoffs, roadblock removal, and buffer protection.

When you pair these KPIs with Takt planning, you get a production control system that doesn’t just measure what happened. It helps you see what’s coming and adjust before problems hit the crew. If your project needs superintendent coaching, project support, or leadership development, Elevate Construction can help your field teams stabilize, schedule, and flow.

A Challenge for Project Teams

Here’s what I want you to do this week. Start tracking these three KPIs alongside your percent plan complete. Track your perfect handoff percentage. Are you handing off cleanly zone to zone? Track your roadblock removal average. Are you finding and removing roadblocks ahead of impact, or are you discovering them when the crew shows up? Track your remaining buffer ratio. Are you protecting your buffers or consuming them faster than planned?

Don’t abandon PPC. Just add the leading indicators that actually help you stay ahead of the problems. And when you see a negative roadblock removal average or a remaining buffer ratio below one, you know the system is under stress and you need to act before the crew feels it. As we say at Elevate, what gets measured gets managed. But what gets measured ahead of time gets prevented. Track the right metrics and protect the flow.

On we go.

Frequently Asked Questions

What is percent plan complete and why is it a lagging indicator?

Percent plan complete measures how many weekly commitments you delivered versus how many you promised. It’s calculated by dividing completed activities by total activities. It’s a lagging indicator because it tells you what already happened, not what’s coming or how to prevent the next failure.

What is perfect handoff percentage and why does it matter more than PPC?

Perfect handoff percentage tracks how many critical zone-to-zone handoffs happened cleanly versus how many were planned. It matters more because handoffs drive flow. You can hit eighty percent PPC but miss critical handoffs, which breaks the train of trades and stops rhythm.

How do you calculate roadblock removal average?

Track the time between when you found a roadblock in lookahead planning and when you resolved it, measured against when the work was impacted. Negative means you’re firefighting after impact. Zero means you’re resolving at impact. Positive means you’re clearing the path ahead of the train.

What is remaining buffer ratio and why is it a leading indicator?

Remaining buffer ratio compares how many buffers you need to finish the phase versus how many you still have. Above one means you’re protected. Below one means you’re burning through safety margin faster than planned. It’s leading because it shows stress before the schedule crashes.

Can you use percent plan complete effectively with CPM?

Not really. CPM-based PPC typically hits fifteen to forty-five percent because the baseline isn’t stable. With Takt and Last Planner combined, you can get above eighty percent because the plan is leveled and properly packaged. Takt enables reliable PPC tracking.