According to piaget’s stages of development, the ability to classify or divide things into different sets and subsets and to consider their interrelationships develops during the stage.

Piaget's 3rd stage of development or known as Concrete Operational

Explanation:

The Piaget's 3rd stage of development also known as Concrete Operational tends to occurs in between ages 7 to 11.  Under this children can start performing concrete operations.  They tend to start reasoning logically only if it can be applied to concrete examples . Also the children start developing the ability where they tend to classify and divide factors into different sets and ponder upon their interrelationships .

intimacy, passion and commitment are the components of a interpersonal relationship emphasized in the triangular theory of love by robert sternberg.

the triangular theory of love says love can be comprehend as this componest form the vertices of a triangle.  

intimacy relates to feelings such as of closeness and connection;

passion relates the drives that brings people together, as physical attraction.

commitment relates to the being in a long-term relationship.

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