The document discusses language development needs in students that are often hidden by their oral competence. It specifically addresses the difference between basic interpersonal communication skills (BICS) and cognitive academic language proficiency (CALP). For students to develop CALP, they need activities that fall in Quadrant B - cognitively demanding tasks that are context embedded. Lessons focusing on Quadrant C also require linguistic and contextual support. Quadrant D tasks, like copying, should be avoided as they do not promote deep thinking.