So I'm working on a form and one of the entries has proved problematic in user tests:
We want to save the frequency of a periodic event, the event is the frequency with which a report should be sent, in our database we will keep a numerical value that describes the hours per year.
It can be more or less once a year, so in the case of every four years, the value we want to save is "0.25" and for four times a year it is "4".
In a previous form, we ask the user to calculate the number by themselves; In use, this has proven to be difficult for users.
We have tested a solution with two input fields, one for the frequency and another for the year: X times per year Y (where X and Y are the input fields). In a user test with 4 users, we only had one solve it relatively without problems and 2 did not solve it at all when they were asked to enter "once every two years".
Any suggestions in other ways for the user to enter the requested data?