FIDIC’s 2017 editions introduced a new Claims management system in clause 20 that channels Claims through two very different procedures. One of them is very simple and involves almost no risk whereas the other will require investment of significant project resources, will take the parties a considerable amount of time to resolve and carries fatal consequences if not followed properly. It has therefore become a priority for anyone handling this Claims management system to understand how clause 20.1 sorts the different types of Claims and to recognise that the classification scheme is not as straightforward as the wording of the Contract suggests, as explored in this article.