An allocation questionnaire is a form that grown-ups fill out when they have a legal problem that needs to be solved by a court. It asks lots of questions about the situation, like who was involved, what happened, and how much money was involved.
It's kind of like if someone took a picture of the problem and wanted to show the judge what happened. But instead of a picture, it's words on a piece of paper. The judge reads the form to understand the problem and decide how to fix it.
Sometimes, the judge might need extra information, so they might ask grown-ups more questions about what happened. But the allocation questionnaire is a good starting point to get an idea of what the problem is and how to solve it.