Modern approach is accepted as an international procedure. It is useful even for those problems where limited observations are possible. It is problem specific and defines method explicitly.

Confidence interval for value of coverage factor 2 is generally taken as 95 % but it is not actual value. The actual value for this is 95.45 %. For 95 % confidence interval, actual ?k? or coverage factor is 1.96.

The equation which is used to calculate expanded uncertainty is a very basic equation. To calculate expanded uncertainty, one will need to multiply a coverage factor by combined uncertainty.

Triangular distribution of Type-B evaluation is used when it is known that most of values used are more likely to be near centre of distribution, rar than at extreme limits.

Better quality transducer can be used to reduce Type-A and Type-B elemental uncertainties. Calibration can quantify Type-A elemental uncertainty, but not reduce it. Calibration can quantify as well as reduce level of Type-B elemental uncertainty.

Rectangular distribution is used when limits can be determined and value of measurand is equally likely to lie anywhere within limits.

The arithmetic mean is used as input estimate in Type-A evaluation of uncertainty, and standard deviation of mean is used as standard uncertainty. Those evaluation of standard uncertainty that is not a Type-A is a Type-B evaluation.

Spread of possible random error values is determined by maximum error. The maximum error for a measurement method is three times standard deviation. The maximum error and standard deviation determine accuracy of measurement.

In analogy with relative standard uncertainty U_r and relative combined standard uncertainty U_c,r relative expanded uncertainty of a measurement result y is U_r = U/ | y |, y is not equal to zero and U is expanded uncertainty.

Resolution, Scale Size and Quantization, Hysteresis, Common Mode Voltage, Installation, Nonlinearity or Linearity, Spatial Variation, Loading uncertainties, Sensitivity and Zero offset, se all are Type-B uncertainties.