Can I use the Gemara Marking System for iyun learning as well?
The Gemara Marking System provides a tremendous foundation for iyun in two ways: First, the system trains one to focus on the precision of the Talmudic text. And iyun, by definition, is sensitivity to detail. Second, the markings ensure that you are firmly grounded in pshat before moving deeper ― for of course, any iyun learning must be predicated on a solid understanding of pshat. Indeed, many talmidim have adapted the markings to iyun learning: Just as key points in the Gemara may be highlighted, so too a long Tosfos can be mapped out structurally using the same basic markings.