Twenty-eight patients on the list. That is the number a PGT in a busy general medicine unit in India can carry on a single shift. It is also, demonstrably, more than working memory can reliably hold.

Miller's classic (Psychological Review, 1956) put the working memory span at 7 ± 2 items. Later work (Cowan, Behavioral and Brain Sciences, 2001) refined this downward to four when items are unlinked. Twenty-eight is approximately seven times that capacity.

What residents actually do is chunk. They group patients by clinical category — three sepses, two CCFs, four post-ops, one stroke. They use bed numbers as anchors. They use the corner of the paper list as a working notation, sometimes a tally, sometimes initials, sometimes a colour code with one pen.

The chunking works for retrieval. It does not work for changes. When patient eleven's potassium comes back at 5.9 between rounds, the chunk doesn't update — the resident has to manually re-encode the patient into a new category. This is when things drop. Not at the patient's bedside. In the gap between the lab returning and the resident's next look at the list.

We measured this informally for a single resident at a tertiary government hospital for a week. Over the seven shifts, the lag between a critical lab returning and the resident actively reviewing it ranged from four minutes (when the lab phoned) to 47 minutes (when it sat in the system unread). Of nine critical-range values, four were noticed by the lab call, three by the next routine round, one by the nurse, and one by the resident reviewing the patient's chart for an unrelated reason.

A workspace should not make the resident remember to look. It should show the change. In Medows, the colour of the patient's card on the ward list updates the moment a new lab value arrives. K+ at 5.9 turns the card amber. ECG findings amend the same card. A new vital out of range shifts the trend strip.

This is not an alert. Alerts get muted. It is a passive change in the surface itself — the kind of change your peripheral attention picks up while you're walking past on the way to another bed.

The 28-patient list problem is real, and it is not solved by trying to remember harder. It is solved by a list that does some of the remembering for you.