Time-dependent questions are those for which the correct answer can vary depending on the timeframe that is assumed. When a question is phrased in the present tense, the implicit timeframe will be the date of the last document in the document collection; thus, systems will be required to return the most up-to-date answer supported by the document collection. When the question is phrased in the past tense then either the question will explicitly specify the time frame (e.g., "What cruise line attempted to take over NCL in December 1999?") or else the time frame will be implicit in the question series. For example, if the target is the event "France wins World Cup in soccer" and the question is "Who was the coach of the French team?" then the correct answer must be "Aime Jacquet" (the name of the coach of the French team in 1998 when France won the World Cup), and not just the name of any past or current coach of the French team.