By ensuring all variables are assigned a value before proceeding to enforce constraints.

By eliminating all values from variables' domains that have previously led to failures.

By randomly selecting values from the domain to test the robustness of variable assignments.

By ensuring that for every pair of connected variables, each value in one variable's domain can be paired with at least one valid value in the other's domain.

By assigning values that are least likely to conflict with future variable assignments.