<prompt> Translate the following text to EnglishUjenzi: sifa, kwa kawaida haiwezi kuchunguzwa, kama vile mafanikio ya elimu au hali ya kijamii na kiuchumi, ambayo inawakilishwa na kipimo kinachoweza kuchunguzwa.  <response>: Construct An attribute, usually unobservable, such as educational attainment or socioeconomic status, that is represented by an observable measure. 