The working guidelines: Non-formal education for promoting co-production of educational resources was developed by CESIE within the CHOICE project aiming at increasing young people’s motivation to choose STEM careers through an innovative cross-disciplinary STE(A)M approach to education. This document serves as a guide to the project partners and members of Creative Leadership Teams in the delivery of A3.3 Design & Development workshops and the co-production of Open Educational Resources (OER). It provides necessary information on the theoretical concepts used in CHOICE: STEM and STE(A)M education, Open Education, and Open Educational Resources (OER). The programme and process of implementation of Design & Development workshops are described, including some practical suggestions for teachers and tutors. The Guide also specifies the description of Creative Leadership Team members’ roles and offered various methodologies to be utilised in co-production of open educational resources, i.e. project-based learning, inquiry-based learning, experiential learning cycle, collaborative learning, co-production and co-creation. Considering the context of COVID-19 pandemics, in which the Guide was created, a brief final section is dedicated to online collaborative techniques with a view to facilitating remote co-creative and learning process.