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This Specification covers a statistical sampling plan for lot inspection by attributes. It verifies that the customer's specified quality level (SQL) is not being exceeded. The estimate of fraction nonconforming determined by EIA Interim Standard No. EIA-554 is used to select the optimum sample plan for verifying that a given lot meets the specified quality level (SQL).

This Assessment Guide is applicable to any assessment technique that wishes to embrace the principles and concepts presented in the EIA-599 National Electronic Process Certification Standard.

Conventional attribute sampling plans based upon nonzero acceptance numbers are no longer desirable. In addition, emphasis is now placed on the quality level that is received by the customer. This relates directly to the Lot Tolerance Percent Defective (LTPD) value or the Limiting Quality Protection of MIL-STD-105. Measuring quality levels in percent nonconforming, although not incorrect, has been replaced with quality levels measured in parts per million (PPM). As a result, this standard addresses the need for sampling plans that can augment MIL-STD-105, are based upon a zero acceptance number, and address quality (nonconformance) levels in the parts per million range. This document does not address minor nonconformances, which are defined as nonconformances that are not likely to reduce materially the usability of the unit of product for its intended purpose.

This Standard is applicable to suppliers of electronic components, assemblies, equipment and related materials. This standard establishes the general requirements to achieve a certified process. The use of this standard is intended for any manufacturing or service company whose goal is to achieve customer satisfaction through continuous improvement.

The procedure outlined in this document is applicable to any manufacturing or service process. It may be used on part of a process or and entire process or a series of sequential processes.

This standard is intended to provide guidance for selecting standardized methods for estimating the proportion nonconforming expressed as PPM. These methods are contained in EIA 554-1, EIA 554-2 and EIA 591.

The general requirements of an SPC system shall encompass, but are not limited to, the following elements: a Overall quality system b Management commitment c SPC system documentation d Critical process nodes e Gage characterization and capability f Process characterization and capability g Control system documentation h On-line/off-line control i Training j Supplier SPC systems k Calibration l Preventive maintenance m Self audit

(From Standards Proposal No. 2358, formulated under the cognizance of the EIA Quality and Reliability Engineering (QRE) Committee.)