To be a co-author
Defining the Role of Authors and Contributors (from International Committee of Medical Journal Editors)
http://www.icmje.org/recommendations/browse/roles-and-responsibilities/defining-the-role-of-authors-and-contributors.html
Four criteria were recommended:
Substantial contributions to the conception or design of the work; or the acquisition, analysis, or interpretation of data for the work; AND
Drafting the work or revising it critically for important intellectual content; AND
Final approval of the version to be published; AND
Agreement to be accountable for all aspects of the work in ensuring that questions related to the accuracy or integrity of any part of the work are appropriately investigated and resolved.
The page also metioned that...
Contributors who meet fewer than all 4 of the above criteria for authorship should not be listed as authors, but they should be acknowledged
cf. Acknowledgements
https://gyazo.com/5a473e7088598eca3657968f6dbcb1e7
https://us.sagepub.com/en-us/nam/credit
日本語版記事:
オーサーシップ、著者の貢献
https://www.chiikiiryo.jp/inoue-methods/inoue-methods/authorship/