Habits
Habits That Depend On Other People
Routines involving another person are more durable when things go well and more fragile when they do not, because the trigger sits outside your control.

Shared routines have a different failure pattern from solitary ones. Understanding where the dependency sits explains both their unusual staying power and their sudden collapses.
Another person supplies a cue you cannot ignore
A solitary habit can be quietly skipped, since nothing external marks the omission. A shared one produces a visible absence, and the prospect of that absence acts as a trigger.
The mechanism is social rather than motivational. Turning up is easier than explaining why you did not, and that asymmetry does a large amount of work.
This is why arrangements with another person survive periods when solitary versions of the same activity would have stopped. The trigger keeps firing regardless of how you feel.
The dependency is also the weakness
If the other person stops, the trigger disappears entirely, and the habit frequently ends with it. Nothing in your own environment is prompting the behaviour.
The collapse is often complete rather than gradual, because the support was structural rather than incremental. Removing it removes the whole mechanism at once.
People who have experienced this sometimes conclude they cannot maintain the activity alone. The more accurate conclusion is that they never built the solitary version of the cue.
Reciprocity determines how long it lasts
Arrangements where both parties gain something survive longer than arrangements where one is effectively supervising the other. Supervision is a favour, and favours have a natural expiry.
Where the benefit is genuinely mutual, each participant has an independent reason to continue. The arrangement stops depending on goodwill and starts depending on interest.
This is worth checking at the outset, because unbalanced arrangements tend to end awkwardly. The person carrying the load withdraws, and both people feel the failure was personal.
Scheduling matters more than enthusiasm
Shared routines fail most often on coordination rather than commitment. A fixed recurring time survives busy weeks; an arrangement requiring negotiation each time does not.
Every instance that requires messages to arrange is an opportunity for the whole thing to lapse. Removing that step is the single most useful design decision.
Fixing the time also removes the implication that any given occasion was chosen. It becomes the default rather than a decision, which is the same advantage solitary habits gain from automaticity.
Building a solitary fallback protects the practice
Maintaining an independent version, however small, means the shared arrangement is an enhancement rather than the foundation. The activity then survives the other person's circumstances changing.
The fallback should use a cue in your own environment. Otherwise it inherits the same dependency it was intended to insure against.
Also by Sam Delacroix
- Ambition, at a sustainable sizeWork & Career
- Wanting the thing versus wanting to have done itGoals & Motivation
- Noise, music and working in shared spaceFocus & Attention
- Reviewing your own systemsHabits





