$n$	Number of surgeries waiting to be performed
$i$	Index of the stage ($i=\mathrm{1,2},3$)
$j$	Index of surgery ($j=\mathrm{1,2},3\dots n$)
$p_{ij}$	The duration of surgery j on stage i
$C_{ij}$	The completion time of surgery j on stage i
$x_k$	The kth solution
$Pop$	Population size
Enlarged sampling space	Calculated by Pop + $⌈P_c\times Pop⌉$
$P_c$	Crossover rate
$P_m$	Mutation rate
MIWOI	Maximum number of iterations without improvement
MaxIteration	Maximum number of iterations
Elitet	The tth solution in elite list
MaxElite	Number of elite solutions stored