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This tool is good for a rough idea of your tps. However, not all abilities and threat altering factors appear in a wws report, so assumptions must be made and this is where innacuracies come from. Currently, this tool only picks up abilities which do damage, heal, and certain power gains. Stance, talents, and buffs aren't known and so are assumed to be threat favorable. Threat from healing and power gains are best case figures, because threat is equally split between all mobs aware of the player, and it's not possible to know how many/which other mobs(if any) were alive for what portions of the fight from a wws report.