Judging vs perceiving: what packing for a move shows about J and P

Two friends turn up on Saturday to help you pack a one-bedroom flat. By eleven o'clock they have produced two completely different piles.

The first friend has made four labeled boxes, all books, all in order, taped, stacked against the wall with the labels facing out. She has also spent forty minutes deciding whether the kitchen counts as one category or three, and there is still a shelf of books untouched behind her.

The second friend has filled nine boxes. Nine. They contain books, a lamp, half the bathroom, a cable of unknown purpose and a bag of rice. Nothing is labeled. The room looks emptier than the first friend's room by a wide margin, and there is no possible way to find the phone charger.

Both of them are helping. Neither of them is doing it wrong. They are running two different procedures for the same job, and a move is one of the few situations where you can watch the difference in real time and see exactly what each one costs.

Decide first, or sort later

The first friend is working to a system she settled before she started. Deciding the categories up front is the expensive part, and once it is done the work is easy and the result is durable. Every box is a finished object. The information about what is inside it is written on the outside, which means it will still be true in three weeks when nobody remembers packing it.

The second friend has deferred every decision that can be deferred. The box in front of him is a container, the thing in his hand goes in it, and the question of what belongs with what is a problem for a later version of himself who will have more information, specifically the information about which room things ended up in. He is not being careless. He is treating sorting as a task to be done once, at the other end, rather than twice.

That is the whole of the last letter of a four-letter type, acted out with cardboard. One person is comfortable once a decision is closed. The other is comfortable while it is still open. Everything else, the labeling, the tape, the nine boxes, follows from that.

Where each one is genuinely better

The labeled approach wins on anything with a long tail. Six weeks later, when you need the winter coats or the tax documents or the good knives, the labeled boxes are the difference between two minutes and an afternoon. It also wins when more than one person is involved, because a system that is written down can be joined by somebody else. A stranger can pack books into the box marked books.

The unlabeled approach wins on throughput, and it wins on the thing nobody plans for, which is that a move always contains a category you did not anticipate. The drawer of objects with no home. The half-used cleaning products. The item that belongs to somebody who moved out two years ago. A system built at nine in the morning does not have a box for those, and the person running the system will stop, mid-flow, and rebuild the categories. The person with no system puts it in the nearest box and keeps moving.

There is a version of this that is easy to miss: the deferred approach is faster precisely because it is not free. It moves the work downstream. Whether that is a good trade depends entirely on whether the downstream moment ever gets the time it needs.

The argument on the last afternoon

Every move has one, and it always happens in the same place, which is the last ten percent.

At this point most of the flat is boxed and what is left is genuinely awkward: the things that do not fit a category, the things you use right up until you leave, the things you are not sure you are keeping. The person with the system wants to keep applying it, and applying it to this material takes longer per object than everything before it did. The person without a system wants to put all of it in one box, call it miscellaneous, and be finished, which is exactly what the system exists to prevent.

What makes this hard is that both are right about the other. The box marked miscellaneous is where things go to be lost for a year. And re-sorting the last four percent of a flat at eight in the evening when the van is booked for eight the next morning is a genuinely poor use of the remaining hours.

The arrangement that works is deciding in advance that the last hour has different rules. One clearly marked box for the awkward material, opened first at the other end, emptied within the week. That is a system, which satisfies one of them, and it takes four seconds per object, which satisfies the other.

It also helps to know which of them you have in the room. Two people running the same procedure will produce more of it: two systems means a long morning of negotiating categories, two piles of nine boxes means a flat cleared by lunchtime and a phone charger nobody will see again. A pair with one of each is slower on the day and better off by the weekend, provided one of them is willing to say out loud which method the afternoon is using.

Unpacking reverses the advantage

The part people forget is that the two approaches swap positions at the far end.

The person with labeled boxes unpacks fast for two days and then stalls, because finishing requires deciding where everything lives in a flat they do not know yet. There is often one room, months later, that is still a wall of correctly labeled boxes.

The person with nine unlabeled boxes has a terrible first week and then finishes, because opening a random box and dealing with whatever is in it is a task they can start without deciding anything. Sorting on arrival is what they planned for all along.

Neither of them finishes early. They fail at different ends, which is the most useful thing this whole comparison shows: the letters do not make one person efficient and the other one not. They put the difficulty in a different place.

This is not about being tidy

The most common misreading of the last letter is that it sorts people into neat and messy. It does not, and a move is a good place to see why. Plenty of people who label every box live in a flat with a chair covered in clothes. Plenty of people who packed the rice with the lamp keep an immaculate kitchen because they like it that way.

The letter is about closure, not tidiness. What J and P actually mean goes through the pair properly, and the same difference on a trip shows what it does when two people have to share one week instead of one Saturday. The sixteen type pages put the last letter next to the other three, which is where it stops being a packing style and starts describing a person.

MBTI is a trademark of The Myers-Briggs Company, which has no connection to this site, and I am not a psychologist. Four letters are a way to name a pattern you have already watched happen.

The practical version is short. If you are the one with the system, accept that the last hour gets a miscellaneous box. If you are the one with nine boxes, write one word on each of them. Neither concession is large and both of them buy back an entire afternoon at the other end.