Social work theory · Volume A: Individual & Psychological

Developmental and life-course theories

Developmental and life-course theories explain how people grow and change from birth to old age, and how earlier experiences shape later outcomes.

1. What it is

Developmental and life-course theories explain how people grow and change from birth to old age, and how earlier experiences shape later outcomes. Stage theories propose that development moves through a sequence of qualitatively distinct periods, each with characteristic tasks. Life-course and life-span theories treat development as continuous, lifelong and shaped by historical time, social relationships and the timing of life events (Elder, 1998; Baltes, 1987). Social workers use these theories to assess whether a person’s difficulties relate to a developmental task or transition, and to understand how disadvantage or trauma at one stage affects the next (Hutchison, 2019).

Psychosocial development (Erik Erikson). Erikson (1950) proposed eight stages across the lifespan, each organised around a psychosocial crisis: trust versus mistrust (infancy), autonomy versus shame and doubt (early childhood), initiative versus guilt (preschool), industry versus inferiority (school age), identity versus role confusion (adolescence), intimacy versus isolation (young adulthood), generativity versus stagnation (middle adulthood) and integrity versus despair (late adulthood). A favourable resolution produces a psychological strength, such as hope or fidelity. Earlier outcomes influence later stages but can be revisited.

Psychosexual development (Sigmund Freud). Freud (1905/1953) proposed that personality develops through oral, anal, phallic, latency and genital stages, each centred on a different source of bodily gratification. Fixation at a stage was thought to produce characteristic adult traits. The theory is now of mainly historical interest, but it introduced the idea that early childhood experience shapes adult personality, which Erikson reworked in social terms.

Moral development (Lawrence Kohlberg). Building on Piaget, Kohlberg (1981) described three levels of moral reasoning, each with two stages. At the preconventional level, judgements are based on punishment and self-interest; at the conventional level, on social approval, rules and law; and at the postconventional level, on social contracts and universal ethical principles. Gilligan (1982) argued that Kohlberg’s scheme, developed largely with male participants, undervalued an ethic of care grounded in relationships and responsibility.

Attachment and early development. Attachment research (see Psychodynamic and psychoanalytic theories and B) shows that early caregiving relationships shape emotional regulation, expectations of others and later relationships (Bowlby, 1969). In developmental terms, secure attachment provides a base for exploration and learning, while early adversity can disrupt development across domains. These findings inform child protection, early intervention and out-of-home care practice (Howe, 2011).

Life-course theory. Life-course theory, developed by sociologist Glen Elder, studies how lives unfold within historical and social contexts. Elder (1998) identified core principles: historical time and place (lives are shaped by the events of their era); timing (the effect of an event depends on when in life it occurs); linked lives (lives are interdependent across relationships and generations); and human agency (people make choices within constraints). His study of children who grew up during the Great Depression showed how economic hardship affected life trajectories differently depending on age (Elder, 1974). Related concepts include trajectories, transitions and turning points.

Emerging adulthood (Jeffrey Arnett). Arnett (2000) proposed emerging adulthood as a distinct period between about 18 and 25 years in industrialised societies. It is characterised by identity exploration, instability, self-focus, a feeling of being in between adolescence and adulthood, and a sense of possibility. The concept reflects later ages of marriage, parenthood and stable employment.

Identity status theory (James Marcia). Marcia (1966) operationalised Erikson’s identity stage by crossing two dimensions, exploration and commitment, to produce four identity statuses: diffusion (neither exploring nor committed), foreclosure (committed without exploration, often adopting others’ values), moratorium (actively exploring without commitment) and achievement (committed after exploration). Statuses can change over time, and longitudinal research shows movement towards achievement with age, although many young adults have not reached it (Kroger et al., 2010).

Life-span developmental psychology (Paul Baltes). Baltes (1987) set out propositions for a life-span perspective: development is lifelong; it is multidirectional, involving both gains and losses at every age; it shows plasticity, or capacity for change; and it is embedded in history and culture. His model of selective optimisation with compensation describes how older adults maintain functioning by selecting priorities, optimising resources and compensating for losses.

2. Historical development

Developmental theory began with psychoanalytic and cognitive stage models (Freud, Piaget), which focused mostly on childhood. Erikson’s decision to extend development across the whole lifespan, and to locate it in social and cultural context, made developmental theory more useful for practitioners working with adults and older people. Kohlberg and Marcia elaborated specific domains of development within this stage tradition.

Life-course and life-span perspectives became independent because they answered questions that stage theories could not: why people of the same age in different historical periods develop differently, and why development continues and varies in later life. Elder drew on sociology and longitudinal research, while Baltes drew on gerontology and experimental psychology (Baltes et al., 1980). Arnett’s emerging adulthood reflects the same attention to historical change. Social work textbooks now commonly use a life-course framework to organise human development content (Hutchison, 2019).

3. Practical guidance

• Locate the person developmentally. Consider which developmental tasks and transitions the person is facing, such as forming an identity, establishing intimate relationships, parenting or adjusting to retirement. A presenting problem may reflect a stalled or disrupted transition.
• Take a life history. Life-course thinking encourages workers to map trajectories, turning points and the timing of key events, such as entry into care, school exclusion or migration, and to ask how these shaped later options.
• Recognise linked lives. A parent’s imprisonment, a grandparent’s illness or a sibling’s disability affects the whole family. Assessments should consider how events in one person’s life shape others’.
• Consider historical and cultural context. Cohort experiences, such as policies of child removal, war, economic recession or the COVID-19 pandemic, shape development differently across generations and communities.
• Use identity status to guide work with young people. Young people in foreclosure may benefit from safe opportunities to explore; those in diffusion may need structure and support to make commitments (Marcia, 1966).
• Avoid rigid age norms. Stage descriptions are general patterns. They are best used to prompt questions about a person’s circumstances.
• Support adaptation in later life. Selective optimisation with compensation offers a practical framework for helping older adults maintain valued activities despite loss of capacity (Baltes, 1987).

4. Critical evaluation

Strengths. Developmental theories give social workers a shared framework for understanding change over time and for linking present difficulties to earlier experience. Life-course theory integrates the individual with family, history and social structure, which suits social work’s person-in-environment perspective. Several concepts, such as identity statuses and attachment, are supported by substantial empirical research (Kroger et al., 2010).

Limitations. Stage theories have been criticised for assuming a universal, linear sequence based on Western, middle-class and often male samples (Gilligan, 1982; Rogoff, 2003). Cross-cultural research suggests that Kohlberg’s higher stages are rarely observed in some societies, raising questions about cultural bias in the scale (Snarey, 1985). Freud’s psychosexual theory lacks empirical support. Emerging adulthood has been criticised as a description of relatively advantaged young people rather than a universal life stage (Côté, 2014). Normative age expectations can pathologise people whose lives follow different but legitimate paths.

Overall importance. Developmental and life-course theories are core content in social work education because nearly all practice involves people at a particular point in their lives. Used flexibly and with cultural awareness, they help workers understand how timing, history and relationships shape opportunity and wellbeing across the life course.

5. References

• Arnett, J. J. (2000). Emerging adulthood: A theory of development from the late teens through the twenties. American Psychologist, 55(5), 469–480. https://doi.org/10.1037/0003-066X.55.5.469
• Baltes, P. B. (1987). Theoretical propositions of life-span developmental psychology: On the dynamics between growth and decline. Developmental Psychology, 23(5), 611–626. https://doi.org/10.1037/0012-1649.23.5.611
• Baltes, P. B., Reese, H. W., & Lipsitt, L. P. (1980). Life-span developmental psychology. Annual Review of Psychology, 31, 65–110. https://doi.org/10.1146/annurev.ps.31.020180.000433
• Bowlby, J. (1969). Attachment and loss: Vol. 1. Attachment. Hogarth Press.
• Côté, J. E. (2014). The dangerous myth of emerging adulthood: An evidence-based critique of a flawed developmental theory. Applied Developmental Science, 18(4), 177–188. https://doi.org/10.1080/10888691.2014.954451
• Elder, G. H., Jr. (1974). Children of the Great Depression: Social change in life experience. University of Chicago Press.
• Elder, G. H., Jr. (1998). The life course as developmental theory. Child Development, 69(1), 1–12. https://doi.org/10.1111/j.1467-8624.1998.tb06128.x
• Erikson, E. H. (1950). Childhood and society. W. W. Norton.
• Freud, S. (1953). Three essays on the theory of sexuality. In J. Strachey (Ed. & Trans.), The standard edition of the complete psychological works of Sigmund Freud (Vol. 7, pp. 123–243). Hogarth Press. (Original work published 1905)
• Gilligan, C. (1982). In a different voice: Psychological theory and women’s development. Harvard University Press.
• Howe, D. (2011). Attachment across the lifecourse: A brief introduction. Palgrave Macmillan.
• Hutchison, E. D. (2019). Dimensions of human behavior: The changing life course (6th ed.). Sage.
• Kohlberg, L. (1981). Essays on moral development: Vol. 1. The philosophy of moral development. Harper & Row.
• Kroger, J., Martinussen, M., & Marcia, J. E. (2010). Identity status change during adolescence and young adulthood: A meta-analysis. Journal of Adolescence, 33(5), 683–698. https://doi.org/10.1016/j.adolescence.2009.11.002
• Marcia, J. E. (1966). Development and validation of ego-identity status. Journal of Personality and Social Psychology, 3(5), 551–558. https://doi.org/10.1037/h0023281
• Rogoff, B. (2003). The cultural nature of human development. Oxford University Press.
• Snarey, J. R. (1985). Cross-cultural universality of social-moral development: A critical review of Kohlbergian research. Psychological Bulletin, 97(2), 202–232. https://doi.org/10.1037/0033-2909.97.2.202