As the key factor of the method, a new access, using the first-maintenance information instead of the traditional sale information to ascertain the sample of failure information, is put forward.

Products with high value and small lot require small size sampling plan which can not solved by traditional single sampling plans.

Since Dixon and Mood gave the up and down method for small samples,the up and down method has been widely used to determine statistical characteristics of material′s fatigue strength.

Considering the problem of small samples in engineering,we analyze the effect ofa priori information credibility and samples in Bayesian statistical decision.

Small sample statistical theory and IC reliability assessment;

In order to assess the reliability of naval ship equipment on zero failure data, a Monte Carlo simulation method was proposed by randomly weighting test samples on the basis of analyzing the reliability assessment of the exponential distribution and the small samples.

In the test evaluation for small sample size,some prior samples are often fused for providing more accurate estimation value.

in this paper we give sufficient and necessary conditions that sample avarages and sample variances .