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Some developmental scientists view development in stages, some in a continuity.
Neither has been agreed on by the entirety of developmental science.

There is also debate on heredity vs. environment, "Nature vs. Nurture".

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Theories hold up every principle/perspective of developmental science. Theories are ideas or guesses that have been tested and proven over and over again.

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Ethical issues can arise with doing research experiments on people because, in un-scientific terms, humans are mushy soft things. We can try to be robots and study ourselves like robots, but we just *are not* robots. People's feelings could get hurt.

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Experiments on People are Hard Because...

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Experiments on People are Hard Because...

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People are incredibly variable and each individual is completely unique one from another. This makes exact, perfect scientific data impossible to come by.

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Experimental Research uses experiments (could you guess from the name?) to discover the cause of something. Scientists use a scenario with some factors that will always stay the same and some factors they can manipulate to see if they get different results.

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With correlational research scientists compare sets of data to find similarities which could show correlation, and potentially causation. For instance, if the childhood obesity rate increases in a city that has a growing fast food industry, the two may be correlated. This is not always reliable, as sometimes which event causes the other may be easily confused, and sometimes things correlate out of sheer randomness.

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Descriptive research records behavior. It doesn't prove much.