How to plan a complex project without carrying it in your head

A complex project gets lost when it lives in your head as a tangle of things to do. Put it outside your head instead: write the outcome in one sentence, decide the next concrete step, split the parts that can run in parallel, keep in view only what you can do now, and review the whole once a week. Below is each step, with what research says about it and where the advice is simply good practice.

Why do big projects stall?

Two things often get in the way: we expect projects to take less time than they do, and their next step is often not clear.

The first is known as the planning fallacy. In a classic study, students predicted they would finish their thesis in about 34 days. It took about 56, and fewer than a third finished by their own best guess. Even their "worst case" estimates were about a week short on average, though about half did finish by then (Buehler, Griffin & Ross, 1994). When we plan, we picture how the work will go and look little at how similar work went before.

The second is about how we think of a task. In experiments, people led to think about a task in concrete terms (how to do it) completed it sooner than people led to think about it in abstract terms (why to do it) (McCrea et al., 2008). A project written as one word, "website" or "move", is abstract; there is nothing to do today, so it waits.

Start with the outcome

Write what will be different when the project is done, in one sentence: "We live in the new flat and the old one is handed back." Goal research has long found that being specific about a goal mostly removes doubt about what counts as done, and that for complex work, near sub-goals on the way help more than one distant goal (Locke & Latham, 2002).

The sentence also tells you when you are done and what does not belong in the project.

Find the next concrete step

For each project, write the next step you could take without thinking further: "call two movers for a quote", not "sort out the movers". If you can, add when or where you will do it.

That small addition is one of the most studied planning techniques, the if-then plan ("when X happens, I will do Y"), known in research as an implementation intention. Across 642 tests it helped reliably, but modestly: the average effect was d = 0.36, and 0.27 for changing behaviour; corrected for publication bias, about 0.15, small by conventional standards. Effects were larger when the plan had a real if-then form and when people were motivated to reach the goal (Sheeran, Listrom & Gollwitzer, 2025).

Which parts can run in parallel?

This step comes from project practice, not research. Many projects have strands with no dependencies on each other: while you look for a flat, you can already ask movers for quotes. Give each strand a name and its own next step, and mark where they meet again. In the example below, both strands end before moving day.

Find a flat:
  Scan the listings
  Visit three flats
Movers:
  Ask for quotes
Moving day

A line ending in a colon names a strand, the indented lines under it are its steps, and a line back at the left comes after both strands are done. Each strand now has its own next step, so one stuck strand does not stop the others.

Keep in view only what you can do now

A step whose turn has not come is not something to do yet. "Moving day" cannot start before both strands are done, so it does not belong on your list yet. Keeping only the possible steps in view keeps the list short enough to trust, while the rest of the plan stays written down, out of your head.

Review the whole once a week

Once a week, go through every project: is its next step still right, is anything stuck, is anything done? Research does not prescribe a weekly rhythm, but it does support checking progress. In a meta-analysis of 138 studies, interventions that had people monitor their progress helped them reach their goals (d = 0.40), more so when progress was written down or shared (Harkin et al., 2016).

Progress also feels good. In nearly 12,000 daily diary entries from 238 professionals, the days people felt best about their work were most often days they made progress on meaningful work, even small progress (Amabile & Kramer, 2011). These are diaries, not experiments, so read them as a pattern rather than proof.

How does Getrid help?

Getrid is a to-do list and project planner. A project starts with one sentence, When it is done, and is a path of steps. Where parts of the work run at the same time, the path splits into flows side by side, like the strands above, and they join again when all are done. A step whose turn has not come waits in the project, off your lists, so your lists show only what you can do now. On the project page, Write the plan turns a whole plan into steps at once, one step a line, just like the example above, and the weekly review points out any project without a next step. If your head is full of smaller things too, start with why you shouldn't keep your to-do list in your head. See how it works or read the questions and answers.

Sources

• Amabile, T. M., & Kramer, S. J. (2011). The power of small wins. Harvard Business Review, 89(5), 70–80. hbr.org
• Buehler, R., Griffin, D., & Ross, M. (1994). Exploring the "planning fallacy": Why people underestimate their task completion times. Journal of Personality and Social Psychology, 67(3), 366–381. doi:10.1037/0022-3514.67.3.366
• Harkin, B., Webb, T. L., Chang, B. P. I., Prestwich, A., Conner, M., Kellar, I., Benn, Y., & Sheeran, P. (2016). Does monitoring goal progress promote goal attainment? A meta-analysis of the experimental evidence. Psychological Bulletin, 142(2), 198–229. doi:10.1037/bul0000025
• Locke, E. A., & Latham, G. P. (2002). Building a practically useful theory of goal setting and task motivation: A 35-year odyssey. American Psychologist, 57(9), 705–717. doi:10.1037/0003-066X.57.9.705
• McCrea, S. M., Liberman, N., Trope, Y., & Sherman, S. J. (2008). Construal level and procrastination. Psychological Science, 19(12), 1308–1314. doi:10.1111/j.1467-9280.2008.02240.x
• Sheeran, P., Listrom, O., & Gollwitzer, P. M. (2025). The when and how of planning: Meta-analysis of the scope and components of implementation intentions in 642 tests. European Review of Social Psychology, 36(1), 162–194. doi:10.1080/10463283.2024.2334563