In any event, but particularly multisport events, there are numerous decisions that are made on race day from the moment you wake up. For example, what time to have breakfast and what to eat? What time to leave? What time to start warm up? What air pressure to run? Which bike rack spot to take? Which cassette to run? How to navigate the course? And so it goes.
Many of the decisions made on race day are irreversible and can potentially have an enormous effect race day performance - to the extent that making one wrong decision can mean the difference between finishing and not finishing a race.
Maximising the likelihood of a worthwhile return on your training investment in any event means preparing for all of the aspects of that event - not just the technical and performance related aspects of the swim, bike and run. When preparing for an event - which type of athlete do you want to be? Do you want to be the athlete who is making first-time decisions on race day; or do you want to be as prepared as you can be for every predictable decision that you are likely to encounter on race day by having well rehearsed and/or researched all of the aspects required to excel on race day.