In inventory sampling, a distinction is made between two methods, namely the estimation method and the test method. In the estimation procedure, various methods are used to deduce the total quantity of the item units to be inventoried and their value from the sample quantity, with a maximum error deviation of 1% with a probability of 95%. In contrast to this, the test procedure does not determine the value of the population, but instead obtains a statement on the regularity of the accounting. This is done using the sequential test. Randomly selected storage units are assessed in a specific order to determine whether the accounting data is correct. Here too, a confidence level of 95% must be achieved. The sequential test is primarily suitable for automated warehouses due to the high requirements for execution and result evaluation.

Source: logipedia / Fraunhofer IML