The Waterfall View: Read Any Schedule in 10 Seconds

The reason you can't read your project schedule is the grouping. Take it off, and the whole job reads top to bottom.

/ The problem: the WBS hides the sequence

Open any Gantt chart and it's grouped by WBS. Foundations in one window, steel in another, MEP somewhere else, every trade in its own little box. You scroll up and down trying to figure out what happens first, second, and third, and you can't. The grouping hides the sequence.

I'd spent most of the first half of my career reading schedules inside that grouped window, scrolling up and down, piecing the order together in my head. The schedule should show you the order. You shouldn't have to assemble it.

/ The fix: strip the grouping, sort by start

Here is the whole technique. Strip the WBS grouping. Sort by start date, oldest to newest. That's it. Now you're looking at the actual waterfall, the real order of work, top to bottom. Ten seconds, and the whole job reads like a story instead of a phone book.

In P6 it's five clicks:

• Right-click in the activity table.
• Open Group and Sort.
• Delete the grouping.
• Close the box.
• Click the Start column until everything sorts oldest to newest.

Then trim it down. All you need showing is four columns: Activity ID, Activity Name, Start, Finish. Anything else is noise when you're reading for sequence.

/ What to look for

Now read it top to bottom like a timeline. Find your crew's scope and look at what's directly above it. That's what's supposed to hand off to you. Ask yourself: is it actually ready? Is it really finishing when the schedule says?

Then scan for the thing grouping hides best: the same crew or resource stacked in two places at once. In the grouped view, each WBS section looks fine on its own. In the waterfall, the overlap jumps out because everything sits in true date order.

That's exactly what it caught on a job I consulted on for CDCR. Same crew, scheduled in three different buildings at the same time. In the grouped view, each building looked fine on its own. Strip the grouping, sort by start date, and there it was. One crew, three places, plain as day.

I didn't invent this, by the way. A colleague named Janie Winning showed it to me back when we were consulting for CDCR. I'd been reading schedules the grouped way for years before she showed me the waterfall. Some of the best techniques in this business come from somebody willing to show you a better way.

/ Two rules

First, put the grouping back when you're done. The WBS view runs your cost and your reporting. The waterfall is a reading lens, not a replacement. Use it to see, then go back to the structure the job runs on.

Second, sort by start date, never finish. Finish order lies to you when durations vary. A ten-day activity and a two-day activity finishing the same week started at very different times. Start date is the truth of sequence.

/ Why this matters

Most schedule problems aren't math problems. They're visibility problems. The information is in there, it's just arranged so you can't see it. The waterfall view doesn't change your schedule. It changes what you can see in it. And what you can see, you can run.

/ Try it this week

Open your Gantt, strip the grouping, sort by start, find your crew's scope, and look at what's directly above it. Notice what jumps out. And on anything that looks tight, ask the three float questions: whose float, on what path, and what's eating it this week?

/ Keep going

That's the whole technique, and it's all here. Nothing held back.

If you want it concentrated, that's what The Plan Room is for. It's my free LinkedIn group for field leaders learning to read a schedule the way it should have been taught. Structured lessons, feedback on your own schedule, and people working through the same stuff alongside you. Come join us: https://www.linkedin.com/groups/40982025/