teaching - How can we promote better writing skills in academic education?

This question may be too wide or in some perspective perceived as unclear but covers a key issue (for me) in academia, namely, academic writing.

Students start their academic career with varying skills in writing. Often, and this the case in my department, there is no thought through progression to go from beginner through novice and proficient to expert level (the latter perhaps in graduate school) or some such scale.

My question is therefore how to get students to progress in appropriate steps through an education. In other words what is a reasonable progression of writing skills through an education. I am looking for suggestions of appropriate expectations for, say, an annual or semester wise increase in difficulty or complexity of exercises with the aim of learning academic writing skills through an education including graduate school.