Methods of allocating raters to assessment visits of studies, and tangible computer readable media including software that is adapted to control a computer to implement methods of allocating raters to assessment visits of studies, are provided. Raters are allocated by retrieving blinding information that includes at least one blinding criterion for a visit of a study, retrieving rater information for at least one rater associated with the study, comparing the retrieved rater information and the retrieved blinding information to identify one or more raters meeting the at least one blinding criterion and enabling selection of the identified one or more raters for allocation to the visit of the study. A rater may then be allocated to the visit by receiving a selection for at least one of the identified raters and allocating the at least one rater to the visit responsive to the received selection.