chapter  43
Rogers' (1957/1959) statement of the necessary and suf®cient conditions has been challenged. While many accept the necessity of these, the suf®ciency is doubted
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Although person-centred theory has never asserted that the socalled `core conditions' of empathy, unconditional positive regard and congruence are necessary and suf®cient conditions for constructive personality change (the hypothesis demands all six conditions, Point 13), research into and criticism of the hypothesis of the necessary and suf®cient conditions usually concentrates on them.