Modifies a noun

• approach: Our theoretical research and the use of tabu search approach to the problem can be found in [ 5 ] .

• algorithm: The tabu algorithm is a powerful optimization tool that allows the search process to escape from local optima whilst avoiding cyclical behavior.

• list: A tabu list of heuristics is also maintained which prevents certain heuristics from being chosen at certain times during the search.

• version: The basic tabu version is better but becomes less reliable for over 150 regions.