Preface -- Introduction -- What are N-of-1 trials?- N-of-1 trials in the behavioural sciences -- N-of-1 trials in medical contexts -- Aggregated N-of-1 trials -- Methodological considerations for N-of-1 trials -- Randomization, allocation concealment and blinding -- Data collection and quality control -- Individual reporting of N-of-1 trials to patients and clinicians -- Assessing and reporting adverse events -- Research ethics and N-of-1 trials -- Statistical analysis of N-of-1 trials -- The economics of N-of-1 trials -- Reporting N-of-1 trials to professional audiences -- Single patient open trials -- Systematic review and meta-analysis using N-of-1 trials -- Where are N-of-1 trials headed?- Index.