This case study examines the developmental trajectory of a 17-year-old female adolescent from prenatal health through adolescence. Drawing on Piaget's stages of cognitive development, Erikson's psychosocial stages, Selman's perspective-taking, and Marcia's identity statuses, the paper traces her physical growth, motor skill development, social relationships, and emerging sexual identity. The subject's athletic strengths, average academic performance, and resilient identity formation in the face of parental disapproval of her homosexuality are highlighted. The paper demonstrates how developmental theories can be applied systematically to a real individual's life history.
The paper demonstrates applied theoretical analysis — taking abstract developmental frameworks and mapping them directly onto concrete biographical evidence. For example, rather than simply naming Erikson's stages, the author illustrates each stage with a specific behavioral anecdote, such as the subject's bed-wetting shame corresponding to the autonomy vs. shame stage, or her altruistic card-making behavior signaling the industry stage. This technique shows how theory and evidence should work in dialogue.
The paper is organized into six sections following the natural arc of human development: a brief introduction establishing the subject's background, a prenatal section covering parental health and teratogen exposure, an early childhood section covering sensorimotor and psychosocial milestones, a middle-to-late childhood section covering cognitive and social development, an adolescence section covering identity formation and sexuality, and a short conclusion synthesizing the key takeaways. Each body section applies at least one major developmental theory directly to the subject's observed behavior.
The subject of this case study is a 17-year-old female high school senior. An only child raised in a military family, she provides a rich example of how one individual progresses through the various stages of psychosocial development. Her life highlights several key concepts of developmental psychology.
Her prenatal development was uneventful, as both parents were healthy. Her early and middle childhood periods were characterized by a loving home environment and active engagement with school activities, especially athletics.
Both of her parents can be described as introverts with a small social circle. The family is strongly influenced by the military: her mother worked as a GS civilian worker on a military base, and her father is a soldier on active duty. She attended Department of Defense (DoD) schools on the military base through middle school, then transitioned to a public high school. She is known for being athletic and participates in basketball and soccer. Unlike her parents, she is outgoing, yet she has never gotten into serious trouble. Her father was involved in her upbringing as much as possible, though his participation was sometimes interrupted by one-year military deployments.
Her mother was 23 years old at the time of birth, and her father was 24. Both parents were in good general health. Her mother was in excellent physical condition during the pregnancy: she exercised regularly and experienced no exposure to teratogens during fetal development. She did not smoke or consume alcohol during the pregnancy. The mother received consistent prenatal care and understood the personal responsibilities involved in bringing a healthy child into the world. Her stress level was described as low to moderate, and she worked only through the first two trimesters.
Both parents had planned the pregnancy and were well prepared for parenthood. This mutual readiness created a positive emotional environment from the very beginning of the subject's life. The father's stable, supportive presence and the mother's careful health practices during pregnancy reflect the kinds of protective factors that developmental researchers associate with healthy outcomes in early childhood.
Physical development progressed smoothly during early childhood. She grew steadily in height and was approximately average for her age. Her sensorimotor development also proceeded well: she smiled and giggled in response to adult smiles, learned to manipulate objects in her environment such as stuffed toys, and showed delight in the sounds of rattles and percussive toys. She learned to mimic sounds early in development and was speaking words and short sentences by age two.
She progressed well through the object permanence phase and through Piaget's preoperational stage of cognitive development. During this stage, she talked frequently about herself, developed a rich and creative storyline involving her dolls, and imaginatively manipulated ideas to suit her unique view of the world — all hallmarks of preoperational thinking.
She also progressed smoothly through the first three of Erikson's psychosocial stages, spanning infancy through early childhood to the preschool years. A deep sense of trust in her parents was established during infancy, as both parents were present and attentive in meeting her needs for feeding and care. During early childhood, she achieved bodily control through toilet training, though she occasionally experienced frustration and appeared to feel shame when she wet the bed — consistent with Erikson's autonomy versus shame and doubt stage.
At the preschool level, her personality began to develop in relation to her peers. Teachers described her as outgoing, and by first grade she was characterized as dominant. This nearly authoritarian quality could have adversely affected her emotional development, but by age seven she appeared to grow out of it and enter what Erikson termed the school-age stage. She became noticeably altruistic — spontaneously making cards and gifts for her friends — signaling a healthy progression into the industry versus inferiority stage.
This subject's story illustrates numerous theories of developmental psychology: from Piaget and Erikson's stages of development to Marcia's adolescent identity statuses. While her story is devoid of serious crises, she has nevertheless experienced a rich childhood that highlights the importance of strong family and social connections. As she enters the next phase of her life as a young adult, it will be instructive to observe the psychosocial changes that take place — particularly as she continues to develop her identity as a gay woman.
"Characteristics of Adolescent Thinking." Retrieved from http://siobhancurious.wordpress.com/2007/09/02/characteristics-of-adolescent-thinking/
Cherry, K. (n.d.). Preoperational stage of cognitive development. About.com. Retrieved from
Harder, A. F. (2009). Erik Erikson's stages of development. Learning Place Online. Retrieved from
"Identity Status Theory." Retrieved from http://www.learning-theories.com/identity-status-theory-marcia.html
"Piaget's Cognitive Stages." (1990). Retrieved from
Always verify citation format against your institution’s current style guide requirements.