Testing JWST's proposal planning system: early progress

The observer program implementation, planning, and scheduling subsystems are undergoing software development for the James Webb Space Telescope front-end ground segment and are being tested in an integrated fashion. This part of the ground system leverages what was developed and fine-tuned for the Hubble Space Telescope over previous decades. This paper will describe the testing design, methods, results, plus the current capabilities and elements still to be developed for these subsystems through the time of publication. We will point out elements from Hubble's systems, from an operations perspective, which have been preserved for the new telescope, and those which require redevelopment.