The Principal Learning components of 14-19 Diplomas (introduced in England in 2008) are assessed predominantly via "controlled assessments". These assessments are conducted within the learning context under specified conditions (or "controls") and require learners to apply their skills to work-related tasks. In this research, teachers and learners at 6 consortia (groups of schools/colleges working together to deliver Diplomas) were interviewed about how controlled assessments in the Diploma qualifications were affecting teaching and learning experiences. The nature of the assessments was seen as encouraging learning and facilitating a less didactic learning environment. The assessments were generally considered less pressurised than traditional assessments, and most learners found the assessment tasks enjoyable and motivating. The assessments were reportedly encouraging the development of valuable skills (e.g., teamwork, communication, independent working) and improving students' confidence. However, there was some evidence that not all teachers had yet fully understood the requirements around the assessment "controls".