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IB DP Psychology — Contexts: Human Development | SL & HL | Paper 1
Learning Intentions By the end of this note, you will be able to:
- Define continuous development, gradual change, and cumulative experience using IB-aligned terminology.
- Explain how continuous models of development differ from stage-based (discontinuous) models and why this distinction matters.
- Describe the role of environment, experience, and learning in shaping developmental trajectories across the lifespan.
- Evaluate research evidence for continuous development using supporting and opposing studies in ACAS format.
- Apply continuous development concepts to a real-world case study from cognitive and sociocultural perspectives.
- Discuss the extent to which development is best understood as a continuous, gradual process rather than a series of discrete stages.
- Analyse continuous development models using relevant concept areas: Causality, Perspective, Bias, and Change.
Introduction & Context
Think about how you learned to read. You did not wake up one morning unable to read and go to bed that night fully literate. Instead, you gradually recognised letters, then sounds, then words, then sentences — each small step building on the last. The same is true of how you learned to walk, to reason, to manage your emotions, and to understand other people. Development, in many of its most important dimensions, appears to happen in this slow, accumulating, almost invisible way.
Psychologists have long debated whether this gradual picture is the correct one. Some argue that development proceeds in clearly defined stages — that children think in qualitatively different ways at different ages, and that these shifts are sudden and universal. Others argue that this stage-based view oversimplifies what is actually a smooth, continuous process of growth shaped by experience. The continuous model of development belongs to this second tradition. Understanding it requires us to ask: is change in human development more like climbing a staircase, or more like walking up a ramp?
🔁 Analogy — The Ramp vs. The Staircase Imagine two paths leading to the same height. A staircase takes you there in sudden jumps — you are on one level, then abruptly on the next. A ramp takes you there smoothly, with every step forward representing a tiny increment of progress. Discontinuous (stage) models of development are like the staircase: qualitatively different levels, clear transitions. Continuous models are like the ramp: the same kind of change happening gradually, with no sharp boundary between one phase and the next. The destination may be the same, but the journey looks very different depending on which model you adopt.
Core Concepts
To understand what psychologists mean by continuous development, it helps to start with what the model is reacting against. Stage theories — such as Piaget's cognitive stages or Erikson's psychosocial stages — propose that development involves qualitative transformations: a child in the pre-operational stage does not just know less than a child in the concrete operational stage; they think in a fundamentally different way. The continuous model challenges this claim. It proposes that what looks like a sudden shift is actually the accumulation of many small, quantitative changes that have been building beneath the surface.
📖 Key Definition — Continuous Development Continuous development refers to the view that psychological growth across the lifespan occurs as a gradual, cumulative process of quantitative change, rather than through sudden, qualitative shifts between discrete stages. Each new ability or behaviour is built incrementally upon prior experience, with no sharp boundaries separating one phase of development from the next.
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