It maximizes the constraints applied to a variable to quickly identify potential conflicts in the assignment.

It systematically assigns the lowest possible value from the domain of a variable to simplify the constraint checks.

It attempts to balance the constraint graph by evenly distributing constraints among all variables.

It selects the variable with the fewest constraints, aiming to reduce the complexity of decision-making.

It chooses a value for a variable that leaves the largest number of options open for other variables.