User feedback regarding a displayed item, such as a web page, is obtained by providing a first and second transport-control elements, such as back buttons, that have the same effect for moving within or between displayable items but which have different associated semantic information. Upon activation of one of the transport-control elements, not only is the required movement effected, but data is output or stored indicative of the semantic information associated with the activated transport-control element. Thus, for example, the semantic information associated with one transport-control element can relate to a good user experience of the currently-displayed item whilst the semantic information associated with the other transport-control element can relate to a bad user experience of the displayed item. Related server arrangements and page and program code are also envisaged.