The Gap Between Planned and Actual
The most reliable finding in personal time data: what was intended for the day and what the day contained are substantially different, in a consistent direction.
Compare a morning's plan with the same day's record and the two describe different days. The difference is consistent enough to plan around. For teams applying “The Gap Between Planned and Actual” to client or project work, employee productivity reporting provides an operational record to compare with estimates; the useful conversation is about scope and delivery, not activity as a substitute for results.
What the gap looks like
The planned items take longer than allowed, typically by a third to a half.
Roughly half the day's actual content was not planned at all.
The first planned item usually happens; the third usually does not.
And the plan contains no transitions, no interruptions and no recovery, which together are a large part of the day.
Why plans are made this way
Planning is done in a calm moment and describes a calm day.
Only the work is visible when planning; the surrounding costs are invisible until they arrive.
And optimism about duration is well documented and does not improve with experience — people who know they underestimate still underestimate.
Which means this is not a discipline problem and cannot be fixed by resolving to plan better.
The measurement worth making
For two weeks: write the plan in the morning, record what happened, compare at the end of the day.
Two numbers per day: planned items completed, and share of the day that was unplanned.
Ten seconds each. After two weeks you have your personal ratio, and it is stable enough to use.
Using the ratio
If half your day is reliably unplanned, plan half a day.
This sounds like giving up and is the opposite: a plan that fits produces completed days, and completed days produce accurate forecasts.
A plan that assumes a clear day fails daily and teaches you nothing except that you are behind.
The three-item rule
Most people's records support about three planned items per day, and one of them substantial.
Beyond that the list is aspirational and its main effect is a sense of failure.
Which is why a short plan with a stated overflow list works better than a long plan: the overflow is explicit rather than being yesterday's failure.
Where the unplanned time goes
Requests from other people, which is the largest share for most.
Consequences of earlier work: the thing that came back, the follow-up, the fix.
Admin that accumulated.
And the recovery after each of the above, which nobody plans and which is proportional to how often they occur rather than how long they take.
What this changes
Estimates improve, because they are built on the real ratio rather than on the imagined day.
Commitments get more honest, which is the subject of its own note.
And the daily sense of failure reduces, which is not a trivial outcome: most of it came from measuring the day against a plan that never fitted.
What to check
What proportion of yesterday was planned in advance?
How many planned items do you complete on a typical day — counted, not guessed?
Does your plan include any transition or recovery time at all?
And is your plan sized for the day you have or the day you would like?
Worth keeping in mind
Plan for the day you have rather than the day you would like. A plan that fits produces completed days, and completed days produce accurate forecasts — which is the opposite of the usual cycle.
The short version
Ten seconds a day for two weeks gives you your personal ratio of planned to unplanned. It is stable enough to plan against, and it converts a daily sense of failure into an arithmetic adjustment.
In short
A plan that assumes a clear day fails daily and teaches you nothing except that you are behind.
A plan sized to the real ratio produces completed days, and completed days produce accurate forecasts.
The point
Two numbers a day for two weeks: planned items completed, and share of the day that was unplanned.
Ten seconds each, and the ratio is stable enough to plan against. For a complementary perspective on work, measurement or planning, consult the International Labour Organization.