This rapid review, commissioned by the Department for Education (DfE) and conducted from February to July 2024, aimed to identify the best available evidence to guide early years practitioners in supporting children aged 0-5 with speech, language, and communication needs (SLCN), specifically stammering, speech sound issues, and language development. Excluding autism-related communication needs, the review focused on three areas: (1) identification and assessment, (2) intervention and support, and (3) working together. Varied evidence sources and tailored methods for each work package were employed. This methodology report describes the methods used to identify studies discussed in the review "Supporting stammering, speech, and language needs in the early years."