Among other things, instances of at least one type of page of a user interface are presented to at least a first user and a second user. Each instance includes a current scope of user interface elements. All of the instances have current scopes that are the same as or subsets of a prototype scope of user interface elements for that type of page. A permitted scope of user interface elements are available to each corresponding user. The permitted scope of the second user is the same as or a subset of the permitted scope of the first user. Selections of user interface elements to be included in an updated scope are received from the first user. The selections include only user interface elements that belong to both the prototype scope for that type of page and the permitted scope of the first user.