Lea Verou schreibt in »In the economy of user effort, be a bargain, not a scam« auf ihrem Blog

This distinction hinges on the distribution of use cases. Products often cut scope by identifying the ~20% of use cases that drive ~80% of usage — aka the Pareto Principle. Some products, however, have such diverse use cases that Pareto doesn’t meaningfully apply to the product as a whole. There are common use cases and niche use cases, but no clean 20-80 split. The tail of niche use cases is so long, it becomes significant in aggregate. For lack of a better term, I’ll call these long‑tail UIs.

Der Beitrag bündelt wichtiges Wissen. Für alle, die Software entwickeln, lohnt sich die Lektüre.