Usability testing is the measurement of ease of use of a product or piece of software. In contrast, usability engineering (UE) is the research and design process that ensures a product with good usability. Usability is a non-functional requirement.
I think in modern world you can associate with only one thing, but it's not the best choice. Bulgarians speak Slavic language as mother tongue, but also many of us speak a Germanic language (English). We have always been part of the Mediterranean world and are pred.Pontid in race, a Med subtype. think in modern world you can associate with only one thing, but it's not the best choice. Bulgarians speak Slavic language as mother tongue, but also many of us speak a Germanic language (English). We have always been part of the Mediterranean world and are pred.
Ethnically the Slavs possess little unity, for they have mixed for centuries with other peoples, including Turko-Tatars, Finnic peoples, Germans, Mongols, Greeks, and Illyrian tribes. The Bulgarians are not of Slavic origin.ources on the history of the ancient Slavs, the ancestors of the modern Slavic peoples, include archaeological and linguistic data, the writings of such Greco-Roman and Byzantine historians as Pliny the Elder, Tacitus, Ptolemy, Jordanes, and Pro-copius of Caesarea, and early medieval chronicles.