• Choose the most constrained variable first.
  • Smallest set of remaining possible values

  • Largest number of arcs to other nodes
  The most constrained variable (smallest number of possible choices) gives the smallest branching factor at the top of the tree; a choice for it will constrain other variables, reducing their branching factors also.

• Choose the least constraining variable value. A more constraining variable value is more likely to have all failures below it.

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