Relationships progress from nonintimate to intimate.
Relational development is generally systematic and predictable.
Relational development includes depenetration and dissolution.
Self-disclosure is at the core of relationship development.[4]
Onion metaphor[edit]
Social penetration is perhaps best known for its onion analogy, therefore it is sometimes called the “onion theory” of personality. Personality is like a multi-layered onion with public self on the outer layer and private self at the core. As time passes and intimacy grows, the layers of one's personality begin to unfold to reveal the core of the person. Three major factors influence self-revelation and begin the process of the onion theory, which are personal