We are developing methods for combining results across studies, primarily based on summary results (from published papers). We work within a framework known as 'triangulation', in which we compare and contrast results of studies that take different appraoches to answering the same underlying question. Where ALSPAC provides relevant data that can be compared with the findings from other types of study, we propose to analyse these. We will select topics in conjunction with external collaborators, ensuring the case studies address important research questions in aetiological epidemiology.