friendliness from the 1st edition. In addition to new material in the contents, there are many more data response style questions and activities, many of which are based on real world cases. Responding to common requests from students, mark allocations and suggested time allocations have been added to many of the activities and data response style questions. The short answer revision questions in the 'over to you' sections have been extended and also given mark and time allocations. OCR specimen papers are included and further guidance is provided on how to approach the AS examinations and pre-issued material. Reflects OCR assessment changes and maintains close syllabus coverage More data response style questions / activities and more short answer revision questions Addition of mark allocations and suggested time allocations in response to student requests for such support