Mechanism
The trap of confusing senior expertise with senior availability
I spent a decade watching transit agencies hire "fractional" planning consultants at $200/hour to come in two days a week and rubber-stamp decisions we'd already made, then act shocked when the plan didn't account for something that only matters on the peak service day. The person was genuinely smart. They just weren't there.
Here's what I think everyone gets wrong about this: fractional work assumes expertise scales linearly with time, and it doesn't. A full-time director of operations isn't twice as valuable as a part-time one because they have twice the hours—they're more valuable because they're embedded in the failure modes. They see the dispatcher's face on the day the entire northern route goes down. They know which supervisor will actually push back on a bad decision and which one won't. They've sat through the 11 p.m. call when something breaks during a winter storm. That knowledge is mostly tacit. You can't compress it into two-day-a-week attendance.
The other thing: fractional work is great if you're optimizing for utilization metrics and labor cost per decision made. It's terrible if you're optimizing for whether that decision actually works at scale under stress. I've seen agencies hire brilliant part-time consultants and then wonder why the plans looked good on the spreadsheet but collapsed when they tried to staff them. The consultant was gone by then. We were stuck explaining why the service plan required 40% more operators than we actually had. So yes, there's real value—just not the kind we usually measure. And a lot of the time what we're calling "fractional executive work" is just underfunding the actual job while pretending we've solved it by hiring a smart person part-time.
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I'd push back here with a real example that cuts the other way. The RAND Corporation did a study of California school districts during the 2008 recession—Stecher et al., if you want the paper—where districts that brought in fractional external evaluators actually *improved* implementation fidelity on instructional reforms, relative to districts that kept full-time internal staff doing the same work. The mechanism wasn't embedding in failure modes. It was distance. The external person wasn't socialized into "this is how we've always done it" and wasn't trapped in the internal politics that made full-time staff reluctant to actually enforce standards.
Your transit case is probably real—I believe it happens—but it's selection on what you're trying to optimize for. If you need someone embedded in the daily crisis machinery and the tacit knowledge of how your specific org actually works under stress, yeah, fractional doesn't work. But if what you actually need is someone to come in and say "no, you're wrong, the spreadsheet is wrong," then the distance is a feature. The fractional consultant doesn't have the same incentives to rubber-stamp your existing decisions. They also leave before you can blame them.
I think the honest version of your argument is: fractional work is great for diagnosis and critique, terrible for execution and accountability. The problem in your case might be that you hired a consultant to do execution work while treating them like a diagnostician.
This maps exactly onto what happened with apprenticeship programs in the 2000s. A lot of contractors realized they could hire an experienced journeyman to coordinate training two or three days a week instead of running a real program, and it worked great until it didn't. The guy would show up, give solid instruction, then disappear. Nobody was there to notice that the apprentice didn't actually understand how to troubleshoot a circuit because the journeyman wasn't there on the day that particular failure mode showed up. Nobody was there to catch that the kid was developing sloppy habits because there was no daily correction, no embedded standards-holding. The knowledge transfer worked like knowledge transfer, but the *reproduction* of standards didn't work at all.
What's tricky is that the fractional person often does deliver real value in their hours—the transit consultant probably gave decent feedback, the training coordinator probably said smart things. So you can point to the outputs and say it worked. You just can't see what didn't happen because nobody was watching. In trades, that shows up five years later when you realize the cohort trained under fractional coordination produces worse work than the cohort before. By then you've already hired the next fractional person to save money.
The math only works if you actually care about failure modes that happen in the gaps. Most organizations don't until the failure is expensive enough that they can't ignore it.
This maps exactly onto what happened in apprenticeship programs when budget cuts started turning full-time coordinators into part-time ones. You'd get someone genuinely competent—maybe a retired journeyman who understood both the trade and how people actually learn it—working two or three days a week. Then you'd wonder why apprentices were dropping out at higher rates, why mentors weren't getting good feedback on their teaching, why the program felt scattered.
The thing is, an apprenticeship coordinator isn't just processing paperwork. They're the person who knows that this particular electrical contractor has started cutting corners on mentorship, or that a plumber's apprentice is flagging because his ride fell through and he's got no other way to get to the jobsite. They show up to the union hall and hear things. They know which employers actually invest in their apprentices and which ones just want cheap labor. A part-timer doesn't have that embedded knowledge, and by the time you realize the program's failing, two years of kids have already quit. You can't fix that retroactively.
The transit post nails it though—we measure the wrong things. We count the hours the consultant was on-site and call that productivity. We never count the service failure six months later that didn't happen because someone was actually there to catch it. We've gotten so comfortable with fractional work that we've stopped asking what we're actually losing.
I think you're describing a real coordination problem, but I'd push back on whether it's actually about time presence versus tacit knowledge. The transit agencies you're talking about weren't failing because the consultant was only there two days a week—they were failing because nobody with skin in the game owned the decision. The consultant had zero accountability. The internal team had all the information but apparently lacked either the authority or the incentive to push back on a bad plan.
That's not a fractional work problem. That's an org design problem where you've outsourced decision-making to someone who bears none of the cost when it fails. A full-time internal director would have owned that failure. A part-time external consultant just... doesn't. You could've hired that person full-time and still had the same outcome if the actual decision-maker (the operations VP, whoever) was still treating them as a rubber-stamp.
The harder question is whether fractional work *enables* this kind of abdication in a way that full-time work doesn't. Maybe it does—there's probably something about "we hired an expert" that lets organizations shut down their own critical thinking faster than "we hired a full-time person who now works for us." But that's a failure of institutional judgment, not a mechanical feature of part-time employment. I'd be curious whether you've seen fractional arrangements that actually worked, and what was different about those orgs.