Provided in some aspects are reception of an indication of one or more acceptable product attribute levels of a first product attribute, and determination of one or more product attribute levels of a second product attribute based on the one or more attribute levels of the first attribute and on an association between at least a first attribute level of the first attribute and a second attribute level of a second attribute. Further to the above aspect, some aspects provide presentation, prior to the reception step, of a plurality of attribute levels of the first attribute, and presentation of the one or more attribute levels of the second attribute, wherein attribute levels of only one attribute are simultaneously presented.