Pleased to meet you <a href="http://barlens.com.au/harga-salep-erythromycin-72f7.pdf">harga salep erythromycin</a>  In 1972, Clayton Alderfer whittled Maslow&#039;s five groups of needs down to three, labelled Existence, Relatedness and Growth. Although elements of a hierarchy remain, "ERG theory" held that human beings need to be satisfied in all three areas - if that&#039;s not possible then their energies are redoubled in a lower category. So for example, if it is impossible to get a promotion, an employee might talk more to colleagues and get more out of the social side of work.