This editorial describes various technical alternatives to improving the toughness in structural adhesives. Toughening, when done correctly, generally results in formulation having improved impact resistance and peel strength without detracting from other properties. The ability of an adhesive to absorb energy without catastrophic failure can be increased through toughening. This means enhanced resistance to fracture, impact, and thermal stress with minimal change in the gross properties of the matrix resin. Improved toughness also results in higher peel strength. The adhesive formulator can improve toughness of the adhesive formulation by various means