What is a problem journal?
A problem journal is a running log of every frustration you notice, in your own life and in other people’s, kept daily for 2 to 4 weeks. At the end you score each entry on how frequently it happens, how much it hurts and whether anyone would pay to make it go away. The highest scores become the problems you research further.
Most founders start with a solution and go looking for a problem to justify it. The journal flips that. It trains you to notice friction you have stopped seeing, and it gives you a ranked list instead of one pet idea. It also costs nothing except attention, which makes it the easiest method on this site to start TODAY.
When should you use it?
- You have no idea yet and want a pipeline of real problems instead of brainstormed ones.
- You have too many ideas and need a fair way to compare them.
- You have deep experience in a job or life situation (nursing, teaching, parenting, running a salon) and want to turn what you see daily into options.
- Skip it if you already have a validated problem with people asking you to fix it. Go straight to problem interviews. Also skip the “own life” part if your life is very different from your target customer’s; then journal from their world through groups and forums.
How do you do it, step by step?
-
Set up one capture place with 6 fields. Use the notes app you already open 20 times a day. Each entry gets: date, what happened (the moment), who had the problem, what they did about it (the workaround), what it cost (minutes, money, mood), and a raw quote if someone said it out loud.
-
Log the moment, never the idea. Write “Spent 25 minutes finding the school trip form in 4 email threads”. Skip “app for school forms”. Ideas written too early close your mind; the moment keeps every solution open. Capture within 1 minute, while the irritation is fresh.
-
Collect other people’s frustrations on purpose. Ask 2 or 3 people a day: “What annoyed you most today?” or “What took longer than it should have this week?” Listen in queues, group chats, school gates, team meetings. Customer complaints at your job count double, because someone already pays to have them handled.
-
Set a daily reminder. A 9 p.m. calendar reminder titled “Problem journal: 3 entries” keeps the habit alive. Our rule of thumb: aim for 3 to 5 entries a day, which gives you 60 to 100 entries after 3 weeks.
-
Review weekly and merge duplicates. Every Sunday, copy entries into a sheet, merge repeats into one row and keep a count column. The count is your frequency evidence, and repeats from other people matter more than repeats from you.
-
Score each problem from 1 to 5 on three scales. Frequency: 1 = once a year, 5 = daily. Pain: 1 = mild annoyance, 5 = costs real money, sleep or a client. Willingness to pay: 1 = nobody would pay, 3 = people pay for a clumsy workaround, 5 = people already pay for a solution and still complain. Multiply the three for a score out of 125.
-
Add a fit filter, then pick 3. For your top 10, add two yes/no columns: Can I reach 20 people with this problem within a week? and Would I happily work on this for 2 years? Keep the top 3 that pass both and take them outside your own head.
What does a worked example look like?
Say Noor, a hypothetical HR coordinator and mother of two, keeps a journal for 3 weeks. She logs 74 entries, which merge into 31 distinct problems.
Her top three after scoring:
| Problem | Frequency | Pain | Pay | Score |
|---|---|---|---|---|
| Chasing managers to approve holiday requests before payroll closes | 5 | 3 | 4 | 60 |
| Finding a sitter for a sick child at 7 a.m. on a workday | 2 | 5 | 4 | 40 |
| Planning dinners that both kids eat | 5 | 2 | 2 | 20 |
The holiday-approval problem scores highest, and it passes the fit filter: Noor knows 30 HR people through her network. She also spots her own bias. The sick-child problem FEELS bigger because it hurt last Tuesday, but it happens less. The scoring keeps her honest. She takes both top problems to Reddit and LinkedIn to check whether strangers describe them in the same words.
Which free tools help?
| Tool | What you use it for | Free plan |
|---|---|---|
| Apple Notes or Google Keep | Capturing entries in under a minute on your phone | Free |
| Google Sheets | Weekly merging, counting and scoring | Free with a Google account |
| Google Calendar | A daily reminder that keeps the habit going | Free with a Google account |
For more ways to generate raw ideas before you start scoring, read the Fe/male Switch guide to business idea generation techniques.
What mistakes should you avoid?
- Writing solutions instead of moments. “Uber for dog walking” tells you nothing in 3 weeks. “Neighbour paid a teenager to walk her dog because her walker cancelled twice” tells you a lot.
- Logging only your own life. You are one person. Aim for at least half of your entries from other people.
- Scoring on the same day. Fresh irritation inflates pain scores. Score at the weekly review.
- Stopping after 5 days. The first week catches the obvious stuff. Weeks 2 and 3 catch the subtle, repeating problems.
- Skipping willingness to pay. A frequent, painful problem nobody pays to solve is a hobby project. Ask yourself who already spends money on it.
How do you know it worked?
After 2 to 4 weeks you have 60+ entries, a scored sheet and 3 problems that pass the fit filter. Our rule of thumb: a problem worth researching scores 45 or more out of 125 and has entries from at least 3 different people.
Go: at least one problem clears that bar and you can name 20 people who have it. No-go: your top scores sit below 30, or every high scorer only came from you. Extend the journal by 2 weeks and spend it in your target customers’ world.
What should you do next?
Check your top 3 problems against strangers’ words with Reddit problem research and Facebook group insights. List the assumptions behind your favourite with assumption mapping, then test them in problem interviews. If you want company on the way, the startup game for women by Fe/male Switch walks you through validation with an AI co-founder.
FAQ
How long should I keep a problem journal?
Our rule of thumb is 3 weeks, with 2 as the minimum and 4 if your entries are thin. Shorter journals capture only the loud problems of one bad week.
What if all my problems are personal and small?
Change where you look. Spend a week journaling at work, in a volunteer role or in online groups of a specific audience. Small problems from your own kitchen rarely carry a business; repeated problems from a group of people who already spend money do.
Can I keep a problem journal with a team?
Yes. Share one sheet, keep the same 6 fields and score together at the weekly review. Different members notice different worlds, so a team journal fills up faster and checks each person’s bias.
Updated 26 October 2026 · Written by the Fe/male Switch team