We had a workshop at NASA/GSFC about Time Domain Multiplexing as a backup to the current Frequency Domain Multiplexing readout. The meeting went extremely well, was well prepared by our US colleagues, and very informative. SRON, CNES, IRAP and APC participated to the workshop in addition to our US colleagues from NASA, NIST. It will be followed by a 6 month exercise to consolidate the inputs and look at the system level implications. This will lead to a report in June. Thanks to Simon Bandler for the organization of the workshop and for his great hospitality.