  The BeyondPlanck and Cosmoglobe collaborations have implemented the first
integrated Bayesian end-to-end analysis pipeline for CMB experiments. The
primary long-term motivation for this work is to develop a common analysis
platform that supports efficient global joint analysis of complementary radio,
microwave, and sub-millimeter experiments. A strict prerequisite for this to
succeed is broad participation from the CMB community, and two foundational
aspects of the program are therefore reproducibility and Open Science. In this
paper, we discuss our efforts toward this aim. We also discuss measures toward
facilitating easy code and data distribution, community-based code
documentation, user-friendly compilation procedures, etc. This work represents
the first publicly released end-to-end CMB analysis pipeline that includes raw
data, source code, parameter files, and documentation. We argue that such a
complete pipeline release should be a requirement for all major future and
publicly-funded CMB experiments, noting that a full public release
significantly increases data longevity by ensuring that the data quality can be
improved whenever better processing techniques, complementary datasets, or more
computing power become available, and thereby also taxpayers' value for money;
providing only raw data and final products is not sufficient to guarantee full
reproducibility in the future.
