This technical paper by Dinusha Bandara, Mark Sipthorp, Fahim Sufi and Galina Daraganova describes the linkage process between the Longitudinal Study of Australian Children (LSAC) and the Australian Early Development Census (AEDC) data.  The paper provides a description of the process of obtaining consent from LSAC respondents, the eligible LSAC sample for AEDC data linkage, the authorities involved in LSAC-AEDC data linkage, LSAC-AEDC data linkage and the matching process (which included five steps: data preparation, data standardisation, a linkage and matching process, AEDC data extraction and linkage of AEDC records), and the outcome of the LSAC-AEDC data linkage. Key characteristics of the LSAC-AEDC cohort are described and compared for the alignment of the LSAC-AEDC cohort to the national AEDC.