An instrument's conceptual base: its link to theory.
Strickland
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D015982:Bias; D006801:Humans; D016294:Models, Nursing; D015399:Nursing Research / Q000295:instrumentation*; D009742:Nursing Theory; D011237:Predictive Value of Tests; D015203:Reproducibility of Results; D012107:Research Design / Q000592:standards