As survey research in second language acquisition grows in popularity, the adherence to best practices associated with questionnaire quality is critical for a better understanding of factors that influence second language (L2) development. To ensure that a self-report scale targets the construct of interest and does it consistently and accurately, authors of primary research should demonstrate that their instrument possesses acceptable evidence of validity and reliability. To this end, this methodological synthesis focused on the state of scale quality in L2 anxiety and willingness to communicate (WTC) research by examining key methodological issues of quantitative survey research and offering empirically grounded suggestions for future studies. A close examination of 232 peer-reviewed articles that used 385 L2 anxiety and WTC scales demonstrated, among other findings, the lack of evidence for scale content and construct validity. The implications of this study contribute to concurrent attempts at methodological reform in applied linguistics.

随着第二语言习得的调查研究越来越受欢迎，遵守与问卷质量相关的最佳实践对于更好地理解影响第二语言 (L2) 发展的因素至关重要。为了确保自我报告量表以兴趣结构为目标，并始终如一、准确地进行，初级研究的作者应该证明他们的工具拥有可接受的有效性和可靠性证据。为此，本方法论综合通过审视定量调查研究的关键方法论问题，并为未来的研究提供基于经验的建议，重点关注二语焦虑和沟通意愿（WTC）研究中的量表质量状态。对使用 385 个 L2 焦虑和 WTC 量表的 232 篇同行评审文章进行的仔细检查表明，除其他发现外，缺乏量表内容和结构有效性的证据。这项研究的意义有助于应用语言学方法论改革的同时尝试。