I in 1917, ended the period in history where individuals studied psychology in Germany to receive the best education. It was at this point that Lillien became interested in applied psychology. Because psychoanalysis did not catch on until after World War I, Lillien was not implementing these theories into her practice. Using herself as a guinea pig, Lillien was able to learn how to correct some effects of getting older. When she realized she was slouching, Lillien paced with a book on her head to perfect her posture.
Memory reaches a peak and then declines.
Her approach to elderly clients included physical and mental tests to see how far their minds had deteriorated. She would then ask about their past, their daily routine, financial situation, immediate and long term future objectives. After completion, and evaluation the patient would do mental and physical exercises. She observed a client in four visits, looking at their past and what she thought they would be like in the future, based on their beliefs and views of life. They had gone from burdens to individuals who could be independent.