You use the scope to define how the page is accessed. Node level pages can be accessed by anyone on that Pega 7 instance. Node level data pages are used for data that can be reused across operators and cases, for example currency rates, list of branches, etc. The scope of request level pages is limited to the requestor, that is the operator, it can be additional data related to the operator. The scope of thread level pages is limited to a given thread for a requestor, which typically is a case. Use thread level pages for case specific data, such as customer details.