The Psychometric perspective (which involves the measurement of psychological variables such as intelligence, aptitude and personality type) 
The Evolutionary perspective (which draws on disciplines outside psychology that include genetics, social anthropology, palaeoanthropology, primatology and ethology)
The computer metaphor.
Two of the research designs used in developmental psychology are:
longitudinal studies: where the same people are followed over time, and their changes in behaviour plotted.
Cross-sectional studies: these look at different people in different age groups, examining their different capacities in terms of cognition, capacity for social relationships etc.
longitudinal studies: where the same people are followed over time, and their changes in behaviour plotted.
Cross-sectional studies: these look at different people in different age groups, examining their different capacities in terms of cognition, capacity for social relationships etc.
Margie Wetherell (found by reading through the figures associated with this perspective)
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