Authorship contribution should be determined in accordance with recommendations from well-respected academic institutions, as they are good models we ought to strive towards. My recommendation is in line with my experience, and the two articles from Yale University and Harvard University.
https://provost.yale.edu/policies/academic-integrity/guidance-authorship-scholarly-or-scientific-publications
https://hms.harvard.edu/sites/default/files/assets/Sites/Ombuds/files/AUTHORSHIP GUIDELINES.pdf
To cite the recommendations set out in the above resources:
Below I will present the criteria for “qualifying” for preliminary consideration for authorship.
A few months in advance of the paper deadline, we should circulate a Google form in a general-member viewable channel that inquires a) their name and contact information, b) the length of their participation in UTAT Space Systems, in months, c) which subsystem they are part of, and d) whether they believe they have made “substantial contributions”. On a subsequent page we will ask the member to describe, using a minimum of 100 words and a maximum of 250 words, what they believe their most important contributions are.
Separately, the leads will choose one primary author - either a lead or a general member - who has contributed a substantial portion to the work already and is ready to take responsibility for managing the publication submission. The primary author is responsible for defining the scope of the publication and preparing an abstract, potentially in collaboration with other subsystem leads who should be also then included as authors).
After the form finishes circulating and gathering replies, the primary author will review the responses and remove entries made in bad faith. For example, people who made false or unsubstantiated claims to contributions should not be included. The primary author must consult with the lead of the subsystem that the form respondee claimed to be part of to verify the veracity of their claims. People may be removed if they a) gave false information at any point during their submission, b) overstated the impact of their contribution, c) if their contribution is not relevant or not significant enough for the purposes of authorship. More about point c) later. People who are removed must be contacted by the method they specified in part a) of the form, with the message indicating they are removed from consideration of authorship; the message should indicate a reason and procedures to appeal the decision. Appeals should be conducted via meeting that involves the primary author and one lead, preferably from the subsystem with which the general member is involved.
What defines “meaningful” “relevance” and “significance” for (co-)authorship purposes? I propose the following set of criteria:
On the other hand, the following contributions are not sufficient to qualify for authorship and instead can be addressed by acknowledging the member in a dedicated section, citing a publication that the member (co-)authored, or neither of the two.