1) Literature Review 1.1) Auxetic behavior in 2D deformation 1.2) Previous research on geometrical structures exhibits behavior in 2D deformation & the capability of this 2D structure to be extended into 3D (literature review, give reference) 1.3) another previous research on geometrical structures exhibits behavior in 2D deformation & the capability of this 2D structure to be extended into 3D (literature review, give reference) 2) Proposed new 2D geometrical structure that exhibits auxetic behavior in 2D deformation. 2.1) Discuss new proposed 2D geometrical structure that exhibits auxetic behavior in 2D deformation. (Picture, Figure about this 2D geometrical structure with auxetic behavior are required) 2.2) discuss the originality of new proposed 2D geometrical structure 2.3) discuss The capability of the 2D structure to be extended into 3D geometrical structure for exhibiting negative Poisson’s ratio in 3D deformation. 3) Reference. .