We present a survey-based approach towards simultaneous elicitation of criteria and weight rank orderings in a group decision analysis setting. Supporting such procedures is of interest for services facilitating online participatory decision analysis where citizens as stakeholders provide input in order to shape both a set of criteria and preferential statements over the set. However, in such a simultaneous approach, the stakeholders do not rank the same elements, as they propose them more or less independently, which leads to aggregation of relatively incomplete and possibly disjoint rank orderings. To address this, we present a useful conceptualization and subsequently identify techniques for aggregating such rank orderings. Furthermore, we propose a method for assessing the aggregation techniques’ equitability by using data from a decision situation in a climate action case.