  In soccer (or association football), players quickly go from heroes to
zeroes, or vice-versa. Performance is not a static measure but a somewhat
volatile one. Analyzing performance as a time series rather than a stationary
point in time is crucial to making better decisions. This paper introduces and
explores I-VAEP and O-VAEP models to evaluate actions and rate players'
intention and execution. Then, we analyze these ratings over time and propose
use cases to fundament our option of treating player ratings as a continuous
problem. As a result, we present who were the best players and how their
performance evolved, define volatility metrics to measure a player's
consistency, and build a player development curve to assist decision-making.
