What is the meaning of "tool weight" in planning?

• A. A measure of a tool's popularity among users.
• B. A heuristic indicating a tool's cost, risk, or expected payoff to influence decision-making.
• C. A timestamp for when the tool should be used.
• D. The physical weight of the tool's implementation.

Answer: (B)

Tool weight in planning is the degree to which a tool's attributes influence the planner's decisions. It acts as a heuristic that encodes factors such as cost, risk, and expected payoff, helping to steer which tool is chosen. By assigning weights, you express preferences or domain knowledge, and the planner combines these with each tool’s attributes to compute a score and select the tool with the best trade-off. It’s not about popularity, a timing stamp, or physical size—the weight reflects how much impact those cost, risk, and payoff considerations have on decision-making. Weights can be set by experts or learned from data, guiding the search toward more desirable plans while balancing trade-offs.