Quick summary: Dr. Fred Hanna did some excellent work on identifying the variables which must be in place in order for a person to experience change. He not only studied these 7 variables he also came out with specific techniques to encourage those variables into existence. according to him the seven precursors of change are A sense of necessity – a willingness or readiness to experience anxiety – awareness – confronting the problem – effort of will towards change – hope for change – and social support for change.