amassing evidence
assize
audit
bone of contention
canvass
catechism
catechizing
change of venue
check
close inquiry
consumer research
consumer-preference survey
court-martial
cross-examination
cross-interrogatory
cross-question
debating point
delving
demand
department of investigation
detection
detective work
enquiry
examination
exhaustive study
exploration
feeler
hearing
indagation
inquest
inquirendo
inquisition
inspection
interrogation
interrogative
interrogatory
investigation
investigative bureau
issue
jury trial
leader
leading question
legislative investigation
legwork
mistrial
moot point
inquiring
questioning
advice
answer
attention
complaint
concern
consideration
criticism
curiosity
debate
discussion
explanation
observation
remark
scrutiny
speculation
diary
expiry