Curriculum integration, focusing on multidisciplinary tasks/projects relevant to the real-world, lends itself to authentic assessment practices. However, attempting to incorporate assessment "of", "for", and "as" learning can be challenging. Using data from two mixed method case studies (n=52, n=27) which tracked middle school student learning throughout separate integrated units, we analyzed the types of assessments used by teachers and the relationship of assessment to student learning. Results and implications for teacher practice are explored.