What makes these claims different
Where the school is a public district, the defendant is a public body, which brings the Illinois Tort Immunity Act into the analysis immediately.
School staff are mandated reporters. A complaint that was received and not reported is itself a documented failure, and districts keep personnel files, prior complaints and transfer histories.
Who the claim is brought against
A claim of this kind is usually brought against the school district, rather than only against the
individual. The theory that most often carries it is failure to report, though in practice
several run together, and which one fits is a question about your facts rather than a category.
Because the responsible body here is usually a public one, the Illinois Tort Immunity Act comes into the analysis, including its immunities and its one-year filing deadline. For childhood sexual abuse, that deadline does not apply: 735 ILCS 5/13-202.2 governs instead. Private schools follow the ordinary rules.
Questions people ask
Does someone have to have been convicted?
No. A civil case uses a lower standard of proof than a criminal one and is usually brought against the institution rather than the individual.
I am asking for someone else.
That is fine and it happens often. There is no obligation on the person involved to do anything.
What if I only remember part of it?
That is ordinary. These cases are built from institutional records rather than from a complete account.