i ∈	I tasks
Is	tasks which produce or consume state (s)
Ij	tasks which can be performed in unit (j)
j ∈ J	units
Ji	units which are suitable for performing task (i)
n ∈ N	event points representing the beginning of a task
s ∈ S	states
Sp	states belong to products
Sr	states belong to raw materials
prices	price of state (s)
STIs	initial amount of state (s)
STFs	final amount of state (s)
ds,n	amount of state (s) delivered to the market at event point (n)
wvi,j,n	binary, whether or not task (i) in unit (j) start at event point (n)
sts,n	continuous, amount of state (s) at event point (n)
${\rho }_{s,i}^P$, ${\rho }_{s,i}^C$	proportion of state (s) produced, consumed by task(i), respectively
bi,j,n	amount of material undertaking task (i) in unit (j) at event point (n)
stmaxs	available maximum storage capacity for state (s)
${\nu }_{i,j}^{\text{min}}$, ${\nu }_{i,j}^{\text{max}}$	minimum amount, maximum capacity of unit (j) when processing task (i)
rs	market demand for state (s) at the end of the time horizon
Tfi,j,n	time at which task (i) finishes in unit (j) while it starts at event point (n)
Tsi,j,n	time at which task (i) starts in unit (j) at event point (n)
αi,j, βi,j	variable term of processing time of task (i) in unit (j)
H	time horizon