A physical parameter is represented by a measurement. These are recorded by their significant figures and get rounded off, if necessary, for further computation. These are often fraught with errors. These errors arise out of nature, instrument and human beings involved. Moreover, errors may be systematic, gross or random. Systematic errors follow definite pattern. These get modeled as per system used and thus get corrected. However, gross and random errors are minimized through statistical analysis. Further, errors also get propagated during computations with those measurements. However, the worthiness of the observed or computed value of measurement can be tested by using standard deviation, an indicator for measurement of reliability. Further, the indicators accuracy, precision and relative precision provide the quality of measurement and thus to test their usefullness.

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