Frequently asked questions and answers
We use Stripe to collect payments. You can pay with a credit card, debit card, or US bank details. One person can pay for multiple people in self-paced courses. You can also pay for yourself.
You can start as soon as you sign up
Description goes here
Group training is usually paid for through grants tied to funded research or programs, or from a departmental or research budget at an institution.
Year round. We prefer people to schedule trainings at least a month in advance.

6218 Georgia Avenue NW, Suite #1, Unit 3189
Washington, DC 20011
Email: contact@cos.io

Unless otherwise noted, this site is licensed under a Creative Commons Attribution 4.0 International (CC BY 4.0) License.
Responsible stewards of your support
COS has earned top recognition from Charity Navigator and Candid (formerly GuideStar) for our financial transparency and accountability to our mission. COS and the OSF were also awarded SOC2 accreditation in 2023 after an independent assessment of our security and procedures by the American Institute of CPAs (AICPA).
We invite all of our sponsors, partners, and members of the community to learn more about how our organization operates, our impact, our financial performance, and our nonprofit status.