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**Project Aims ** The Suicidal Mind Mapping Project (SMMP) operates under the umbrella of the Mind Mapping Project (MMP), which is aimed at employing state-of-the-science methods to improve psychometric testing of mental factors (i.e., latent traits such as personality, psychopathology, and attitudes). The first aim of the Suicidal Mind Mapping Project is to improve the measurement of suicidal attributes. We recently developed the 'free culture' Suicidality Scale (assessing key universal suicidal symptoms) in English and Chinese, with additional studies in Spanish and Thai. We are working on scales for both adolescents and adults. Follow-up work will focus on clinical assessments and improving the measurement of suicidal outcomes. Later, we aim to develop other measures of psychosocial factors. **Methods** Our scale development will begin with large diverse cross-sectional surveys in English and Chinese, with Time 2 surveys to examine test-retest reliability. Surveys include an item pool of previously tested suicidality items, scales on depression, anxiety and related factors. **Analyses** We will examine classical test theory (CTT), but focus on more modern and appropriate item response theory (IRT), exploratory factor analysis (EFA) and bifactor analysis, as well as other methods to thoroughly examine item and scale properties. **Open collaboration** We are open to collaborating with scholars and practitioners worldwide. We do our best to follow best-practices in research methodology when contributing to the project. We are looking for collaborators to test the scale in different populations and languages, age groups. etc. Please contact the lead researcher for more information. We are also open to suggestions on methodology and any other study factors. Output We have published one of our studies, on the internal suicidal debate, here: https://journals.plos.org/plosone/article?id=10.1371/journal.pone.0246341 The citation is: Madsen, J., & Harris, K. M. (2021). Negative self-appraisal: Personal reasons for dying as indicators of suicidality. PloS One, 16(2), e0246341. https://doi.org/10.1371/journal.pone.0246341