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The least range of dispersedness of the values provides the Brown's model of additive smoothing out, to which is peculiar to concentrate on the trend.
Theories concerning situational constraints lead to the expectation that perceived time pressure and geographical dispersedness of the task will also play an important role.
The second dimension of e-mail's perceived applicability, its perceived usefulness, is explained by the geographical dispersedness of a user's task, the extent to which a critical mass of users exists in his or her environment, e-mail's perceived ability to overcome limitations of time, and again, its perceived richness.
E-mail use is also explained by critical mass (if such a critical mass of users exists, it is used more), by the geographical dispersedness of a user's task, and by age--older persons use e-mail less than younger persons.