The Principle: There is always going to be a certain irreducible complexity in every system. This built-in complexity will either be managed by the system or passed on to the user.
Relevance in the Year 2025: Surface simplicity is what people want today, but in the background, products are becoming increasingly complex. AI integrations, multi-step workflows, and rich personalization create powerful capabilities—but also potential confusion.
Platform Proliferation: Users now interact with products on mobile, desktop, voice assistants, and new AR/VR interfaces. UX laws offer common guidelines that apply across all of these platforms.
Tesler's Law reminds us that complexity is not gotten rid of, but redistributed. The important question is whether or not users will face that complexity themselves or if the system will handle it for them.Real-World Application: TurboTax's AI-Powered Simplicity: Instead of bombarding taxpayers with tax documents and IRS jargon, TurboTax uses conversational AI to guide taxpayers through step-by-step question-and-answer processes. In the background, hundreds of tax laws are being calculated, but taxpayers are given simple, context-relevant questions.
The Outcome: Rates of task completion boosted by 30% over the traditional tax software.
A Guide to Applying Tesler's Law
Use Intelligent Defaults: Auto-fill forms with probable responses based on user information.
Progressive Disclosure: Initially show only the essential options, while allowing access to advanced features when necessary.
Contextual Automation: Automate routine decisions using artificial intelligence, but retain users in control of important decisions.
Clear Mental Models: Organize complex features into familiar patterns that individuals already know.
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