The Booth function is a two-variable benchmark with a known global minimum, making it a reliable target for checking whether an optimization method reaches the right solution. section 7.8
Particle swarm optimization (PSO) uses it as a visible search landscape: particles move through the space, converge on a region, and are checked against the known target at x=1, y=3. section 7.8
A known target for the drone problem
A drone design treats aluminum and plastic as two variables. The ratio 1:3 produces a fitness value of 0, the minimum, so the swarm's result can be verified rather than guessed. section 7.8
