How do scientists make inferences for something they cannot directly observe? The Black Box approach seems ideal to help students understand how scientists work. Black Boxes are sealed units; their interior is not accessible. The effort to determine their possible content (internal structure) demands successive modifications in hypothesis,…

The issues arise in performing laboratory hands-on activity are: the less frequency in its implementation, the lack of students' interest, the limited in time, and lack of preparation. By considering the importance of laboratory hands-on activity, it is necessary to examine the conditions of the hands-on activity in school whether the activity has…