This plan is for you if you have done some sprint distance racing and want to get faster. You're ready for increased intensity in your training. You can cycle 1-1.5hrs, run 45 minutes, and swim comfortably for 1000yds currently. You've done a season or two of triathlon or another aerobic sport, and have the aerobic base to pick up the tempo a bit. You have 16 weeks before your event, and up to 7 hours per week to devote to training.
This plan uses heart rate zones and perceived effort for pacing and effort level.