Ask a coordinator why they did not book a science program and the honest answer is usually time, not money. The calendar is already full, every minute is spoken for, and an incursion feels like a whole day you have to find from somewhere you do not have it. But the time problem is more tractable than it looks, and most of it dissolves once you stop treating enrichment as time taken away from the curriculum and start seeing where it actually replaces, rather than adds to, the teaching you were already going to do.
Enrichment isn't extra time if it replaces a lesson you'd teach anyway
The framing that makes enrichment feel impossible is treating it as an addition to an already-full timetable, a new thing crammed on top of everything else. But a curriculum-aligned session does not add to your science teaching, it is your science teaching for that block. The forces incursion delivers part of the forces unit you were going to teach regardless of whether a facilitator was involved.
Seen that way, an aligned session costs no extra time at all. It simply changes who delivers one of the lessons you had already timetabled, and delivers it with equipment and expertise you did not have. The session that genuinely costs time is the unaligned one that sits outside your units and connects to nothing you are teaching. That is the kind worth being protective of your calendar about. The aligned one is a substitution, not an addition.
The follow-up doesn't need its own week
Teachers sometimes avoid enrichment because they imagine an elaborate follow-up they cannot fit anywhere, a whole sequence of lessons spinning out of a single visit. They do not need one. Two or three short touches, a capture task, one discussion, a forward link to the next topic, fold into lessons you are already running rather than requiring new ones to be found.
The consolidation that turns experience into learning takes minutes, not a unit's worth of time, and much of it can happen inside lessons that were already on the timetable. The mental block is usually a misestimate of what follow-up requires. Once you realise the follow-up is a handful of deliberate moments rather than a second curriculum, the time objection to the whole exercise largely disappears, because the expensive part you were dreading turns out not to exist.
Place it where it does the most work for the least disruption
Timing reduces the time cost. A session placed mid-unit, when students already have the vocabulary and the basic concept, needs less set-up and less recovery than one dropped in cold, because students arrive ready rather than needing to be oriented from scratch. The same session costs less of your time when it lands at the right point in the unit.
Priming the lesson before takes ten minutes and means the session starts at pace rather than spending its opening stretch getting students up to speed. These placement and priming choices are small, but they extract more value from the same number of minutes, which is the whole game when time is the binding constraint. Smart timing is effectively free, and it raises the return on every minute the facilitator is in the room.
Batch the logistics to protect your own time
Much of the time cost of an incursion is administrative rather than instructional: the booking, the confirming, the organising of the space, the back-and-forth over dates. This is the coordinator's time, and it is the genuinely scarce resource in most of these decisions, more so than the lesson time itself. Reducing this overhead is where a busy coordinator gets the most relief.
Running multiple classes through a single facilitator visit, or settling a recurring arrangement rather than negotiating each booking from scratch, collapses that administrative load substantially. The instructional time is largely a substitution for teaching you would do anyway, so the real time saving comes from batching the logistics so you spend less of your own scarce hours per session delivered. A provider who makes this easy is worth more than one who is marginally cheaper but generates a fresh round of coordination every time.
Count the time it gives back
There is a hidden credit on the other side of the ledger that rarely gets counted. A specialist running a high-quality practical session is doing preparation and delivery you would otherwise carry yourself: sourcing the equipment, setting up the fair test, managing materials you may not even have access to. For a teacher without a science background, that is hours of preparation avoided, not added.
And the lesson is delivered at a standard that would have taken that teacher considerably longer to reach on their own, if they could reach it at all. So the time ledger is not all cost. Against the time the incursion takes, set the preparation hours it saves and the quality it delivers without your effort, and for many teachers the net position is far better than the gross figure suggests. The session does not just consume time. For the right teacher and the right topic, it gives a meaningful amount of it back.
