Choice–One answer: Closed questions in which the user is able to choose one sole answer.
Choice–One Answer (Drop Down): Closed questions where the user is only able to select one sole answer, and the possible answers are shown in a drop-down menu.
Choice–Multiple Answers: Closed questions where the user is able to choose as many answers as he/she finds applicable.
Rating scale–Matrix (one answer per row): Questions where several items are shown that are individually evaluated over a scale that only allows one answer per row.
Rating scale–Matrix (multiple answers per row): Questions with several items that are individually evaluated in a scale with several options that allow more than one answer per row.
Rating scale–One answer (Horizontal): Shows the question and beneath it a scale with the anchors at both ends to evaluate the question or issue.
Rating scale–Semantic Differential Scale: A type of scale that allows us to put two opposite adjectives at both ends.
Rating scale–Net Promoter Score (NPS): A rating of satisfaction measured over the willingness to recommend the website or tested service, classifying them in 3 groups: promoters, detractors and passives.