Reliable Datum Features

In this Question Line video, Jason answers the following question regarding datum features: 

Can you please make a video about what is a testable datum?

Jason mentions that there is no technical terminology in the standards defining a testable, or reliable, datum feature. However, he explains that unreliable datum features can be avoided by following the functional intent of the part, walking through two drawing examples to explain the thought process behind selecting datum features.  

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