A damped turbine blade assembly (490, 491, 492, 493) for use in a gas turbine engine, the damped turbine blade assembly (490, 491, 492, 493) comprising: a first turbine blade including a base, an airfoil comprising a skin extending from the base, and an upper shroud located opposite from the base and including a first small slot having a first small slot top surface, a first small slot bottom surface located opposite of the first small slot top surface, and a first small slot side surface extending from the first small slot top surface to the first small slot bottom surface; and a damper (495, 496, 497, 498) configured to be positioned within the first small slot and simultaneously contact the first small slot top surface, the first small slot bottom surface, and the first small slot side surface; and a second turbine blade including a base; an airfoil including a skin extending from the base; and an upper shroud (465b, 465c) extending from the airfoil opposite from the base and including a second large slot (486b,c,d) having a second large slot top surface (487b,c,d), a second large slot bottom surface (488b,c,d) located opposite of the second large slot top surface (487b,c,d), and a second large slot side surface (489b,c,d) extending from the second large slot top surface (487b,c,d) to the second large slot bottom surface (488b,c,d); the damped turbine blade assembly being characterised in that the second large slot (486b,c,d) is sized larger than the first small slot. a first turbine blade including a base, an airfoil comprising a skin extending from the base, and an upper shroud located opposite from the base and including a first small slot having a first small slot top surface, a first small slot bottom surface located opposite of the first small slot top surface, and a first small slot side surface extending from the first small slot top surface to the first small slot bottom surface; and a damper (495, 496, 497, 498) configured to be positioned within the first small slot and simultaneously contact the first small slot top surface, the first small slot bottom surface, and the first small slot side surface; and a base, an airfoil comprising a skin extending from the base, and an upper shroud located opposite from the base and including a first small slot having a first small slot top surface, a first small slot bottom surface located opposite of the first small slot top surface, and a first small slot side surface extending from the first small slot top surface to the first small slot bottom surface; and a damper (495, 496, 497, 498) configured to be positioned within the first small slot and simultaneously contact the first small slot top surface, the first small slot bottom surface, and the first small slot side surface; and a skin extending from the base, and an upper shroud located opposite from the base and including a first small slot having a first small slot top surface, a first small slot bottom surface located opposite of the first small slot top surface, and a first small slot side surface extending from the first small slot top surface to the first small slot bottom surface; and a damper (495, 496, 497, 498) configured to be positioned within the first small slot and simultaneously contact the first small slot top surface, the first small slot bottom surface, and the first small slot side surface; and a first small slot top surface, a first small slot bottom surface located opposite of the first small slot top surface, and a first small slot side surface extending from the first small slot top surface to the first small slot bottom surface; and a damper (495, 496, 497, 498) configured to be positioned within the first small slot and simultaneously contact the first small slot top surface, the first small slot bottom surface, and the first small slot side surface; and a second turbine blade including a base; an airfoil including a skin extending from the base; and an upper shroud (465b, 465c) extending from the airfoil opposite from the base and including a second large slot (486b,c,d) having a second large slot top surface (487b,c,d), a second large slot bottom surface (488b,c,d) located opposite of the second large slot top surface (487b,c,d), and a second large slot side surface (489b,c,d) extending from the second large slot top surface (487b,c,d) to the second large slot bottom surface (488b,c,d); a base; an airfoil including a skin extending from the base; and an upper shroud (465b, 465c) extending from the airfoil opposite from the base and including a second large slot (486b,c,d) having a second large slot top surface (487b,c,d), a second large slot bottom surface (488b,c,d) located opposite of the second large slot top surface (487b,c,d), and a second large slot side surface (489b,c,d) extending from the second large slot top surface (487b,c,d) to the second large slot bottom surface (488b,c,d); a second large slot top surface (487b,c,d), a second large slot bottom surface (488b,c,d) located opposite of the second large slot top surface (487b,c,d), and a second large slot side surface (489b,c,d) extending from the second large slot top surface (487b,c,d) to the second large slot bottom surface (488b,c,d); the damped turbine blade assembly being characterised in that the second large slot (486b,c,d) is sized larger than the first small slot.