Summer camp application form: where parents quit

A parent fills in the child's name, date of birth, session and allergies, then presses submit. The page reloads with a red message about a medical contact the parent does not remember being asked for. The field sits in a section that was collapsed, or it only appears when a condition is met, such as choosing a session that needs a medical form. The parent scrolls, cannot find the field, and the form does not say which section holds it. Some parents close the tab. The owner's own answers fill every field, so the owner never meets the gap.

• Tab through the form with a keyboard. Does any required field sit inside a section you did not open?
• Submit with one field empty on purpose. Does the error name the field and the section it sits in?
• Choose a session that is full. Does the form say so before the parent types everything?
• Add a second child. Does the form add the child to the same application, or start a blank one?

Many camp forms are built around one child, because the owner tests with one child. A parent with two children has to fill the form twice, or find a field that adds a second child. If the second application starts blank, the parent retypes the family name, address and emergency contact. If the first child's answers are lost on the way back, the parent gives up or enters something wrong. Both are easy to miss in a test that uses one child.

Find this cause with two children on purpose. Enter the first child, go back one step, and check whether the answers are still there. Then start the second application and note what the form asks you to type again. A form that makes the parent repeat the family details has a different fix from one that drops answers, so the run should show which one you have.

A medical section, a swim test or a photo release often sits behind a heading that opens on click. The field inside is marked required, but the section looks closed, so the parent does not know it exists until submit fails. The error names no section. The parent reads 'Please complete all required fields', then searches a long form for a red box. Open any section that holds a required field, or say in its heading that an answer is needed inside.

Check it with a keyboard. Press tab from the first field to the last, and note any field that receives focus inside a section that looked closed. Then submit with one field left empty on purpose and read the error. If the error does not say where the field is, the cause is the message, not the field. A simulated visitor runs the same steps and shows the field where it stopped, with a screenshot of the error.

A parent usually picks a session first, because the dates fit a holiday. If that session is full, the form may accept the choice and reject it at the last step, after the parent has typed the medical history and the emergency contact. A parent who has done that work may start again rather than pick another session, because the first one was the reason for the visit.

Test it with a session you know is full. Choose it, fill the rest, and submit. If the form warns you before the last step, the cause is solved. If the warning comes after, the fix is to check capacity when the session is picked and show the next open session in the same place. The run shows the step where the rejection happens. It cannot tell you whether a parent would have picked another session.

A new session, a new medical question or an update to the form tool can open a section that was closed, or mark a field required with no visible label. The form still submits in your own tests, because your family data fills every field. Rerun the two child path after each change. Check the form on a phone and on a laptop, since a collapsed section can behave differently on each.