Assertiveness is the ability to express thoughts, feelings and needs clearly, directly and respectfully, without aggressing against the other person or submitting to their demands. It sits at the midpoint between two dysfunctional extremes: aggressive communication (imposing) and passive communication (silencing). Daniel Goleman includes it within social skills, the fifth pillar of emotional intelligence, and Marshall Rosenberg considers it the natural outcome of well-practised Nonviolent Communication: when you know what you need and can express it without attacking, you are assertive.
| Style | What it prioritises | Typical phrase | Result |
|---|---|---|---|
| Passive | The other person's wishes | "It's fine, whatever you want" | Accumulated resentment |
| Aggressive | One's own wishes, unfiltered | "Things are done my way" | Fear and distance |
| Assertive | Both parties equally | "I need X. How do you see it?" | Mutual respect and agreement |
The lack of assertiveness is rarely about not knowing what to say. It is about fear:
Brené Brown's research connects these fears to vulnerability: assertiveness requires showing what you need, which exposes you to the possibility of being denied. That exposure is what makes assertiveness an act of courage, not just a communication technique.
Psychologists Sharon and Gordon Bower developed the DESC model, which complements Rosenberg's NVC approach:
Saying no to extra work (without guilt): "I appreciate that you thought of me for this project. Right now my plate is full and I would not be able to give it the quality it deserves. Can we revisit this next month?"
Setting a boundary with a parent: "Mum, I love you and I value your advice. When it comes to how I raise my children, though, I need you to trust my decisions, even when they differ from yours."
Expressing a need to your partner: "I've noticed I've been feeling drained lately. I need one evening a week that's just for me — to read, walk, or do nothing. It's not about wanting time away from you; it's about recharging so I can show up as my best self."
The line can feel thin, but it is critical:
| Assertive | Aggressive |
|---|---|
| "I need..." | "You must..." |
| Respects the other's right to disagree | Demands compliance |
| States a boundary | Issues a threat |
| Voice is firm and calm | Voice is loud or hostile |
| Seeks dialogue | Seeks submission |
Gottman's research confirms that assertive communication — raising issues directly but respectfully — is a hallmark of stable, satisfied couples. Aggressive communication, on the other hand, escalates into the Four Horsemen cycle.
Passivity stores resentment like a pressure cooker. Every suppressed "it's fine" adds another degree of heat. Eventually, the lid blows off, and the explosion is disproportionate to the trigger. The other person is bewildered: "Where did that come from?"
Goleman describes this as the "emotional hijack" of accumulated micro-frustrations. The antidote is not more suppression but more frequent, smaller assertions. Saying "that bothers me" today prevents the volcanic eruption next month.
At the deepest level, assertiveness is a statement about self-worth: "My needs matter as much as yours." People who struggle with assertiveness often carry an unconscious belief that their needs are less important — a belief usually rooted in early experiences where their voice was silenced or punished.
Carl Rogers, founder of person-centred therapy, argued that unconditional positive regard — the experience of being valued without conditions — is what allows a person to develop the confidence to speak their truth. In relationships, practising assertiveness is simultaneously an act of self-care and an invitation for the other person to be honest in return.
Assertiveness respects both your needs and the other person's. Aggressiveness prioritises your needs at the expense of the other's. An assertive person says "I need X"; an aggressive person says "You must give me X". The first opens negotiation; the second demands compliance.
Absolutely. Assertiveness is not about being harsh; it is about being clear. You can set a firm boundary with a warm tone. In fact, the kindest thing you can do in a relationship is be honest about what you need, because the alternative — silent resentment — is far more damaging.
Start small. Express a mild preference where you would normally say "I don't mind": choose the restaurant, state your opinion on a film. Build from there. Each successful assertion rewires the brain to associate honest expression with safety rather than danger.
If your partner is used to you being passive, your new assertiveness may initially feel threatening to them. Be patient and consistent. Explain that being honest about your needs is an investment in the health of the relationship, not an attack. At LetsShine.app, the AI can help you rehearse assertive statements and anticipate responses.
Yes. Like all emotional intelligence competencies, assertiveness is trainable. Rosenberg's NVC framework, the DESC model and regular practice in low-stakes situations gradually build the skill. LetsShine.app offers a safe space to practise expressing needs and setting boundaries before bringing them into real conversations.
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