Is there a type of question that will only allow the answers for different responses to add up to 100%? In other words, in the survey I'd like to ask what the percentage of ad spend is in several areas. Obviously you can't spend more than 100% (of advertising budget), but using a matrix and offering people the a range of answers means they could answer 100% for each area - which I'd like to avoid. Any help would be great. Thanks.