What is most important while writing on the blackboard?

Clarity in writing is most important on the blackboard, since every learner must read it without strain.

Clear, legible writing ensures the content reaches all students accurately.

Good handwriting helps but is narrower than overall clarity, which also covers size, spacing and sequence.

Writing only in big letters can waste board space and still not guarantee readability.

Writing in small letters reduces visibility for students seated at the back.

Blackboard work belongs to the clarity dimension of effective teaching behaviour.