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''r<sub>internal</sub>'' is the internal distribution in the RFV which is the possibility distribution of the systematic contribution to the total uncertainty. This distribution can be built based on the information that is available about the measuring instrument and the process.
The largest possible distribution is the uniform or rectangular possibility distribution. This means that every value in the specified interval is equally possible. This actually represents the state of total ignorance according to the [[Dempster–Shafer theory|theory of evidence]]<ref>{{Cite book|title=A mathematical theory of evidence|last=Shafer, Glenn, 1946-|date=1976|publisher=Princeton University Press|isbn=0691081751|___location=Princeton, N.J.|oclc=1859710|url-access=registration|url=https://archive.org/details/mathematicaltheo0000shaf}}</ref> which means it represents a scenario in which there is maximum lack of information.
This distribution is used for the systematic error when we have absolutely no idea about the systematic error except that it belongs to a particular interval of values. This is quite common in measurements.
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