Veröffentlichungsversion / Published Version Zeitschriftenartikel / journal article Dieser Beitrag ist mit Zustimmung des Rechteinhabers aufgrund einer (DFG geförderten) Allianz-bzw. Nationallizenz frei zugänglich. / This publication is with permission of the rights owner freely accessible due to an Wolfgang Bandilla Lars Kaczmirek GESIS-ZUMA, Cen ter fo r Survey Research and Meth odology, Mannheim, GermanyTo compare the effectiveness of different prenotification and invitation procedures in a webbased three-wave access panel survey over 3 consecutive months, we experimentally varied the contact mode in a fully crossed two-factorial design with (a) three different prenotification conditions (mobile short messaging service [SMS], e-mail, no prenotice) and (b) two "invita tion and reminder" conditions (SMS, e-mail). A group with nearly complete mobile phone coverage was randomly assigned to one of these six experimental conditions. As expected, SMS prenotifications outperformed e-mail prenotifications in terms of response rates across all three waves. Furthermore, e-mail invitation response rates outperformed those for SMS invitations. The combination of SMS prenotification and e-mail invitation performed best. The different experimental treatments did not have an effect on the sample composition of respondents between groups.

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nline environments can be programmed to make use of movable, drag & drop objects. A drag & drop object is a geometric figure (which may contain text, pictures, or both) whose position on the screen can be changed by the user. Typically, a user accomplishes this by (a) moving the cursor over the object with a mouse or other pointing device, (b) holding down button that "grabs" the object, (c) dragging the object to a new location by sliding the mouse or pointing device, and (d) dropping the object at the new location by releasing the button.Drag & drop objects can be useful in several selfadministered measurement domains of interest to social scientists; these include visual analogue scales (VASs; Couper,