Abiejų apklausų metu naudoti identiški, standartizuoti ISAAC klausimynai, kuriuos — mokslo metais pildė pirmokų tėvai, o po septynerių metų — patys 13—14 metų amžiaus moksleiviai. Advertisement Advertisement Advertisement cookies are used to provide visitors with relevant ads and marketing campaigns. Nuo m. Norint peržiūrėti paspauskite Maarten, Duffel; 3 St. Belo Horizonte Brazil.

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