From a scientific (or statistical) viewpoint, establishing the player with the most goals ever demands rigorous methodology and strict definitions. Modern football benefits from advanced data tracking, making contemporary records highly verifiable. However, historical records present significant challenges due to inconsistent documentation, varying definitions of 'official' matches, and the absence of centralized governing bodies during earlier eras. Statisticians rely on sources like the International Federation of Football History & Statistics (IFFHS) and the Rec.Sport.Soccer Statistics Foundation (RSSSF), which meticulously attempt to verify goals against available historical records. The scientific perspective emphasizes the distinction between 'official competitive goals' and 'total career goals.' Official goals typically include league matches, domestic and international cup competitions, and recognized international 'A' matches. Total career goals, conversely, might encompass friendlies, youth matches, and other unofficial fixtures. Without a universally accepted, retroactive standard applied across all eras, statistical comparisons remain inherently imperfect, leading to different legitimate answers depending on the criteria used.