The question of "questions on notice" are interesting as I witnessed in Senate Estimates (Military equipment questions in which Sen Fawcett featured). It appears a question on notice must be answered, but an obsfucated answer that does not really answer the question, needs to be asked again. One simply can't "not accept" the answer and demand a better answer. Same goes with different public servants answering to those on say 6 months convenient leave. This obviously puts pressure on the "asker" to fit in with Parliamentary calendar dates before the "askee" can be put on the spot again.
I think next Senate Estimates RAA&T are August and then 2013 sittings.
My observations of today's proceedings only, someone may be able to confirm these observations?