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where do naturalistic obs take place?

why may controlled observation be preferred someties?

like ainsworth recording data from two way mirror makes it?

some control over variables including?

NATURALISTIC / CTRLLED OBSERVATIONS ; EVAL

why naturalistic obs tend to have high external validity?

but lack ctrl over research situations makes what difficult?

there may also be many uncontrolled?

that make it more difficult to

ctrlled obs in contrast may produce findings that can't be?