Response form security device

In combination:

• a) a generally planar response form having a generally flat surface with a length and width and an answer area bearing a first plurality of answer blanks in a first plurality of rows spaced in a lengthwise direction upon which a respondent makes marks to indicate a response;
• and
• b) a response form security device comprising:
• a sleeve having a length and width, a blocking wall, sides spaced in a widthwise direction, and a top and bottom spaced in a lengthwise direction, the sleeve and response form configured so that the sleeve slidably receives the flat surface of the response form with the sleeve and response form operatively engaged with the lengths of the response form and sleeve aligned so that the blocking wall covers the flat surface and thereby blocks visual access to answer blanks that the blocking wall overlies;
• and
• an access window formed in the sleeve and through the blocking wall and constructed so that less than all of the answer blanks in the first plurality of rows of answer blanks over which the access window aligns with the sleeve and response form operatively engaged are visible by the respondent through the access window,
• the operatively engaged sleeve and response form configured to be movable selectively lengthwise relative to each other so that visual access through the access window is permitted to different rows of answer blanks in the first plurality of rows of answer blanks upon which marks are made through the access window to indicate a response while the blocking wall covers other rows of answer blanks in the first plurality of rows of answer blanks upon which a respondent makes marks,
• the length of the sleeve and configuration of the answer window chosen so that the blocking wall covers a plurality of the answer areas except all but one or a plurality of the answer areas that are visually accessible through the access window, as the response form and sleeve are moved lengthwise relative to each other into a plurality of different relative positions with the sleeve and response form operatively engaged,
• the plurality of answer areas visible through the access window at any time not sufficient to allow observance of a repeatable pattern of marks through the access window with the response form and sleeve in the plurality of different relative positions to permit any significant copying of responses,
• the length of the sleeve and configuration of the answer window further chosen so that with any rows of answer blanks visually accessible at the access window, a sufficient number of the other rows of answer blanks with marks thereon and not visible through the access areas are covered by the blocking wall so that at any time it is not possible to observe any repeatable pattern of marks made in the other rows of answer blanks.