In experimental work, it typically involves direct or indirect observation of the researched subject(s), e.g., in the laboratory or in the field, documents the methodology, results, and conclusions of an experiment or set of experiments, or offers a novel interpretation of previous results.
Daɣ alxidmăt net tan amiyiz, ităjăš  tat akăyăd oɣădăn meɣ ifrăɣăn n harăt wa fal ija fărak, almităl , daɣ laboratwăr meɣ teren , kăttăbăn immik, xal tan d inăš ăš ăn n amiyiz meɣ majmuɣăt n imiyizăn meɣ hak alkittăb afăhăm n xal tan wi azzărnen.