Also regarding text/research selection...
Two main thoughts - and this is in regard to Gulf War and Health Treatment for Multisymptom Illness (2013) - I'll call this text: GW&H 2013, for short.
1) I've noticed that in the above-named text, the GW&H 2013 committee references work done by previous Gulf-War-and-Health committees.
So, I'm not sure that any given committee critically evaluates the conclusions reached by a previous committee. If this is true - that any given committee unquestioningly accepts the work of a previous committee - then "evidence" gathered for GW&H 2013, for exmple, automatically includes "evidence" gathered in any previous IOM report.
It seems then that IOM committess are not independant, but very-much interdependant. The names of their reports even announce this. GW&H "Volume" 1, 2, 3, etc. "Volume - one book of a related set or series." It could be argued that the subject, GW&H, makes these texts related. But I think the key is that the texts are interdependant.
Maybe a question for IOM should now be, "Will the ME/CFS committee use GW&H committee conclusions to form its definition of CFS?"
2) Quotes from GW&H 2013:
"The committee conducted a systematic review of treatments for CMI, following guidance in... In January 2012, a number of reference databases... were searched by using terms relevant to treatment for CMI... earch terms included CMI, Gulf War syndrome, Gulf War illness, unexplained illness, undiagnosed illnesses, undiagnosed symptoms, medically unexplained symptoms, somatoform disorder, fatigue, pain, concentration, memory, headaches, and gastrointestinal symptoms. In addition to consideration for the systematic review, the search identified relevant resources for use in other parts of the report." (p.30-31 / p.53-54 pdf)
How and by whom were these search terms determined??
Page 31 (p.53 pdf) also has "Selection of Evidence" info. (I haven't read through all of this, though I already have more questions.)
A lot of this - the text itself plus all the good comments others have made above regarding evidence selection, etc. is new for me and will take a while to absorb. But it (the Selection of Evidence) may be interesting/useful to those who are far ahead in their understanding/knowledge of all that's at hand / in play. Wish my brain lasted longer...