MPF	Multi-point forming
IE	Internal Energy
SE	Strain Energy
DOE	Design of Experiments
RSM	Response Surface Methodology
ANOVA	Analysis of Variance
FEM	Finite Element Modelling
BHF	Blank Holder Force
DOF	Degrees of Freedom
$E$	Young’s Modulus
$\sigma$	True Stress
$\epsilon$	True Strain
$k$	Coefficient of Strength
$n$	Strain Hardening Exponent
$\nu$	Poisson’s Ratio
$\rho$	Density
${\sigma }_Y$	Yield Strength
${\sigma }_F$	Fracture Strength
$W$	Strain Energy Density
$C_{01}/C_{10}$	Deviatoric Response Coefficient
$D_1$	Volumetric Response Coefficient
$\overline{I_1}/\overline{I_2}$	Invariants of Deviatoric Strain Tensor
$J_1$	Elastic-volume Ratio for Thermal Expansion
$K_0$	Initial Bulk Modulus
${\mu }_0$	Initial Shear Modulus
$R$	Response Variable
$x$	Process Parameter
β0 – β14	Polynomial Response Coefficients
$ϵ$	Random Process Error
QC	Quality Characteristic
RSME	Root Mean Square Error
$Z_i$	Amplitude of Wrinkle Wave
$n$	Number of Wrinkling Waves
$s$	Thickness Variation Given as a Standard Deviation
$x_i$	Data Point
$\overline{x}$	Mean Thickness of Data Set
$N$	Number of Points in Data Set
$A$	Normalised Maximum Cushion Thickness
$B$	Normalised Cushion Cut-out Base Radius
$C$	Normalised Cushion Cut-out Profile Radius
$D$	Normalised Punch Loading Profile
$SD$	Forecast Standard Deviation