why pre assess?
The sooner the teacher pre assesses ahead of teaching the more accurate ...
... and the more useful the data is.
The two example mp4s (in the link above) are examples of creating pre assess assignments, following a pre-assess plan which marries with a scheme of learning.
Follow your scheme of learning to know when to create a pre assess assignment.
Follow you pre-assess plan to know what to pre assess.
The mp4 in the link above shows how to do this.