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AIMA-Java Core Algorithms from the book Artificial Intelligence a Modern Approach 3rd Ed.

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package aima.core.search.framework.problem;

import aima.core.agent.Action;

/**
 * Artificial Intelligence A Modern Approach (3rd Edition): page 68.

 * 

 * The step cost of taking action a in state s to reach state s' is
 * denoted by c(s, a, s').
 * 
 * @author Ravi Mohan
 * @author Ciaran O'Reilly
 */
public interface StepCostFunction {
	/**
	 * Calculate the step cost of taking action a in state s to reach state s'.
	 * 
	 * @param s
	 *            the state from which action a is to be performed.
	 * @param a
	 *            the action to be taken.
	 * 
	 * @param sDelta
	 *            the state reached by taking the action.
	 * @return the cost of taking action a in state s to reach state s'.
	 */
	double c(Object s, Action a, Object sDelta);
}