Regarding PCB and PCA reliability.
Plated through hole integrity is the most important metric
to monitor.
Vias are small plated through holes used to connect signals
passing from one layer to another layer.
90% of all bare board pcb failures (open and shorts) can be
traced to bad vias. That being said, reviewing cross sectioned samples of your boards prior to assembly is a critical to ensure long term reliability of your products.
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