The No Blur Principle (NBP) is confronted with developments in Norwegian dialects. The NBP helps us explain why the suffixes of the most productive class do not become Ôsuper-stableÕ: that would have entailed a violation of the NBP. If affixes associated with the most productive class have become super-stable, something has been done with other suffixes, so the NBP is complied with, by and large. The NBP did not have to ÔbiteÕ, for the suffix distribution is partly extra-morphologically motivated. This indicates a Ôbelts-and-bracesÕ strategy to ensure inflectional distinctness. The paper also presents arguments in favour of Natural Morphology.