Designing forms is difficult. Often what is best on desktop is a very bad solution on mobile. Sometimes the research we have about form design is conflicting. So I am always interested to learn more about how different types of form perform.
The Government Digital Service has been testing different ways of entering a date of birth. Initial findings are that using drop-down menus confuses some users. Their approach of using three text fields for day, month and year appears to have tested well – although users still pause to consider whether to include a leading zero.