“…It is usually measured by asking people how personally important their attitudes are, how concerned they are about them, and how important an attitude is in comparison to others. Importance has been demonstrated to contribute to greater temporal stability of attitudes (Krosnick, 1988a), stronger attitude-behaviour relationship (Jaccard & Becker, 1985;Nederhof, 1989;Schuman & Presser, 1981); greater resistance to change (Borgida & Howard-Pitney, 1983;Ewing, 1942;Fine, 1957;Rhine & Severance, 1970), and attitudinal effects to other cognitions such as perceptions of others (Clore & Baldridge, 1968) and perception of differences between political candidates (Krosnick, 1988b). Importance is positively related to attitude certainty (Nederhof, 1989;Raden, 1985), knowledge (Judd & Lusk, 1984), extremity (Krosnick, 1988b;Sidanius, 1988), amount of experience with the attitude object (Nederhof, 1989); and to accessibility (Krosnick, 1989, Tourangeau, Rasinski, & D'Andrade, 1991Roese & Olson, 1994).…”