In 2000, psychologists Sheena Iyengar and Mark Lepper set up a jam-tasting table in a grocery store. Some hours it displayed 24 jams, other hours just 6. The big display drew more browsers — but the small one sold ten times the proportion of jam. Faced with 24 options, people overwhelmingly chose nothing at all.
Your to-do list is a 24-jam table that you visit thirty times a day.
Choice overload, decision fatigue, and your task list
Two related effects are working against you every time you open a long list:
Choice overload is the jam effect: as options increase, the probability of choosing any of them drops, and satisfaction with whatever you do choose drops too. Comparing 20 tasks — each with its own urgency, dread, effort and guilt — is expensive, so your brain often declines to run the computation. That’s the freeze; we cover its full anatomy in Task Paralysis.
Decision fatigue is the running cost: decision quality degrades as you make more of them. Every “what should I do next?” consultation of your list is a withdrawal from the same account you need for actual work. By afternoon, the account is empty — which is why late-day list-staring so often ends in scrolling.
Together they produce the paradox every productive person knows: the longer the list, the less it gets done.
The standard fixes don’t quite work
- Prioritisation systems (Eisenhower boxes, ABC ranking, MoSCoW) reduce the comparison — but they are decisions. You’ve moved the fatigue upstream, not removed it, and the full list still glares at you during work.
- The “top 3” method is better, but three visible items still invite ranking-on-the-fly, and the other 17 usually lurk on the same page.
- Shorter lists via aggressive deletion work — briefly — until reality refills them.
The consistent lesson from the research isn’t “choose better”. It’s see fewer options at the moment of choosing. The jam table with 6 jars sold more not because the jams were ranked well, but because the comparison was cheap.
The one-jam table
Take it to the logical end: at the moment of action, show one option.
This is the design bet behind The One Thing. You still keep a full list — capture everything, forget nothing — but the app’s main screen shows only the top task. The expensive question “what should I do next, out of everything?” is replaced by a cheap one: “will I do this, or not?”
Three things happen psychologically:
- The comparison disappears. One item requires no ranking. The jam is chosen; you just taste it.
- Decisions get batched. You order the list occasionally (or just drag one thing to the top), then execute for hours without deciding anything. Decision fatigue stays low because decisions stop being ambient — they happen at chosen moments.
- Refusal becomes information. With a list, avoidance is invisible — you just drift. With a single task, not doing it is a noticeable act you can interrogate: why am I not doing this one? “Waiting on Sam’s figures” is data; silent drift isn’t.
Making it work in practice
Whether or not you use our app, you can apply the principle today:
- Split storage from action. Your capture list can be as long as life demands. Your action view should show one item. Never work while looking at storage.
- Decide next-task at completion time, not at start time. You have momentum and context right after finishing something; use it to tee up the next thing.
- When you refuse the one task, don’t swap it silently. Write down why, then either shrink it (too big), unblock it (waiting on something), or consciously shuffle it (fine — but on purpose).
- Cap active commitments. A limit on active tasks (The One Thing’s free tier caps at 10) is a feature, not a restriction — it forces the triage your future self needs.
Fewer jams, more jam
Choice overload research keeps reaching the same conclusion across shops, retirement plans and speed dating: abundance of options feels like freedom and functions like a brake. Your to-do list is not exempt.
So flip it. Keep the abundance in storage, and put exactly one thing in front of you. The One Thing does it by design — free on iOS, Android and the web — but the principle costs nothing: one visible task, chosen cheaply, done often.