(b) Twice a day is perhaps the easiest to manage with minimum organization
(c) If an issue is available at the end of every session (i.e. at meal and coffee breaks), it is well integrated into the conference process
Key factors to efficiently manage Bulletin production at an optimal frequency are fairly accurate estimates of messaging rate, typing throughput, and fast accurate typing. There is no excuse for having a system based on people "who can type" rather than on people "who can type efficiently - for extended periods". The issue of language skills may also be important (see also Typist / P3; Staff Qualifications / P4; Bottlenecks / S5).