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How should limit or boundary sample be handled/controled?

We create these samples when we see examples of things that are suspect. For example we are a molding company and we will get flash in an area that will not affect fit or function but we want to make sure we don't ship something with extreme flash so we create a max limit sample. We have many of these type of sample and do not get the customers sign off. We just know based on experience what we can ship.
http://elsmar.com/Forums/showthread.php?t=26880

In many cases, operators still rely on boundary samples, which exemplify the minimally acceptable quality for the part at a particular process stage. "We have boundary samples for molding, priming and painting," says Dyke. "If the operators have any questions regarding the quality of a surface, they compare it to the boundary sample to deem whether the part is acceptable or not acceptable."
http://www.compositesworld.com/articles/automotive-composite...

Estabelecer amostras limite e/ou especificações para aceitação/rejeição das peças. Estabelecer critérios de saída para o Nível I
http://www.dana.com.br/fornecedores/pdfs/Manual_Fornecedores...

Devem ser considerados, p. ex.:
- Planos de regulagem
- Dispositivos auxiliares de fixação/de comparação
- Equipamentos flexíveis para troca de ferramentas
- Amostra limite
http://www.google.com.br/url?sa=t&source=web&ct=res&cd=33&ve...