As an earlier technology, blackboard - besides being mainly a tool used by teachers to present content to students - was (and still is) a resource applied in classrooms to foster collaborative learning. For a long time, teachers have been using it to promote discussions among their pupils, asking them to solve problems, write answers and show to the whole class what they really think.

It's correct to say that the traditional way of teaching - which includes a blackboard in the classroom - has a positive and negative side: traditional or not, knowledge was promoted; but, at the same time, this promotion was in many aspects one-sided (one only person was at the center of the class, almost like a king known by his sudits - the students - as the most powerful character).

Although we have lots of new ways to ignite interaction in class nowadays, we must agree that blackboards  have left us a legacy of shared knowledge.

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