जब एकत्रित किए गए आंकड़ों की संगति (स्थिरता) को समय के विभिन्न बिंदुओं पर मापा जाता है, तो उसे किस रूप में पहचाना जाता है?

A researcher wants to explore the effect of possible factors on the organization of effective computer-based learning interventions in schools. Which research method is most appropriate for this study?

Which of the following steps is NOT essential while designing a questionnaire?