[ripped from http://www.psychology.iastate.edu/~ccutrona/uclalone.htm]
The UCLA Loneliness Scale was developed to assess subjective feelings of loneliness or social isolation. Items for the original version of the scale were based on statements used by lonely individuals to describe feelings of loneliness (Russell, Peplau, & Ferguson, 1978). The questions were all worded in a negative or lonely direction, with individuals indicating how often they felt the way described on a four point scale that ranged from never to often. Due to concerns about how the negative wording of the items may have affected scores (i.e., response sets), a revised version of the scale was developed and published in 1980 that included 10 items worded in a negative or lonely direction and 10 items worded in a positive or non-lonely direction (Russell, Peplau, & Cutrona, 1980). Recently, Version 3 of the UCLA Loneliness Scale has been published
(Russell, 1996). In this most recent version of the scale, the wording of the items and the response format has been simplified to facilitate administration of the measure to less educated populations, such as the elderly.
The UCLA Loneliness Scale has clearly become the most widely used measure of loneliness, with over 500 citations in the Social Science Citation Index of the 1980 publication on the measure. Scores on the loneliness scale have been found to predict a wide variety of mental (i.e., depression) and physical (i.e., immuncompetence, nursing home admission, mortality) health outcomes in our research and the research of others.
[and the questions are ripped from http://www3.shastacollege.edu/lvalvatne/psych15/ucla_loneliness_scale.htm]