Ricardo Viana Vargas is a project management specialist who has overseen over 80 major projects totaling $18 billion. He discusses four main methods to measure earned value (BCWP): 1) using milestones with weighted values, 2) a fixed formula by task, 3) percentage complete estimates, and 4) equivalent completed units. The most used methods are percentage complete estimates and equivalent completed units due to ease of use and ability to account for repeating activities, though fixed formulas are gaining popularity for their precision.