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Salmon developed a five-stage model of e-learning and e-moderating that for some time has had a major influence where online courses and online discussion forums have been used. [13] In her five-stage model, individual access and the ability of students to use the technology are the first steps to involvement and achievement.
Because of the factorial function in the denominator of the PDF and CDF, the Erlang distribution is only defined when the parameter k is a positive integer. In fact, this distribution is sometimes called the Erlang- k distribution (e.g., an Erlang-2 distribution is an Erlang distribution with k = 2 {\displaystyle k=2} ).