Ego states in Transactional Analysis include Parent, Adult, and Child. These ego states represent different aspects of our personality responses and behaviors in various situations. The Parent state involves learned behaviors and attitudes from caregivers, the Adult state represents logical and objective thinking, and the Child state involves emotions and past experiences.

Okay, let me give this a try. The structural ego state model refers to the structural source of that ego state as an established pattern of thought, affect, and behavior. This model shows where ego states come from: the Parent ego state is structured from introjects of our parental / authority figures, the Adult ego state is our integrated self in the here and now, and the Child ego state is the first ego state to form and represents the patterns of thought, affect, and behavior we used as children.

The functional ego state model refers to the function of each ego states, what each one of them does. This is the model that distinguishes between the double functions of the Parent (Critical for protection, management, system of values, and Nurturing for permission, encouragement, assistance) and of the Child (Adapted - with a role in socialization and relation to the rules and Free - for emotional expression, creativity, etc.) In this model, we see the Adult ego state as the integration of all ego states, realistically adapted to the here and now, focused on thought and problem-solving.

Basically, in my understanding, the difference is that each model explains a different aspect of the ego states (structure and function respectively - hence the name of the models.)

Some resources on the subject: http://www.functionalfluency.com/articles_resources/The_Graphics_of_Ego_States_by_Servaas_van_Beekum_1.pdf and

http://www.ta-psychotherapy.co.uk/ego_states.htm

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