The problem of sampling with probability proportonal to a size measure
and with some control over the probabilities of joint selection of
pair's of units has a history that goes back to about 1943.It is also
well known that the problems related to sampling witout replacement with
unequal probabilities have attracted and continue to attract the
attention of many scholars and statisticians especially in recent years.
In this monograph extensive dealing to design based and model based has
been coverd. Some new estimators have been suggested to solve many
problems. Most important point which has discussed is recommendation for
users.