Before an executive can write a strategy, they must diagnose the current reality.

PESTLE looks at the outside world. You cannot control these factors; you can only react to them. (e.g., A new Legal privacy law destroys a tech company's ad model, or a Social trend toward veganism forces a fast-food chain to adapt).

SWOT looks at both.

• Strengths/Weaknesses are internal (your brand, your cash reserves, your terrible supply chain).

• Opportunities/Threats are external (a competitor going bankrupt, a looming recession).

The MBA Marketing Insight: Most people do SWOT poorly by just making bulleted lists. A true strategist connects them. You ask: "How can we use Strength A to capitalize on Opportunity B? How can we fix Weakness C before Threat D destroys us?"