This course taught me to clearly communicate my main message.
Before this course, I wasn't consciously concerned with how I wrote down my message. I often thought; as long as everything is in there. As a result, I wrote long reports. This made it unclear what was important. This course teaches you to think more consciously about how & what you write down. Because of this it may take more effort to write the report, but in the end it will be much shorter & more concise! As a result, you will have less to explain or correct.
After the course, you still need to practice to master the method. I see my reports getting clearer step by step (and I get this back from my readers!). I would recommend this course to anyone who wants to learn how to write concisely!