SYSTEMS THINKING PROBLEM SOLVING DESIGN JUDGEMENT RESEARCH ITERATIVE EXPLORATION PROTOTYPES VISUAL HIERARCHY TYPOGRAPHY SPACING COMPONENTS PATTERNS CONSISTENCY LAYOUT MOTION MICROINTERACTIONS DENSITY DESIGN SYSTEMS TOKENS COMPONENT GOVERNANCE REUSABILITY DOCUMENTATION SYSTEMS THINKING STANDARDIZATION VERSIONING DESIGN TOKENS SOURCE OF TRUTH DEV COLLABORATION TECHNICAL FEASIBILITY DESIGN TO CODE FRONT-END ALIGNMENT SEMANTIC HTML RESPONSIVE CSS STATES IMPLEMENTATION OPTIMIZATION WCAG EDGE CASES BUSINESS NEEDS STAKEHOLDER ALIGNMENT TRADEOFFS SCALABILITY CROSS-FUNCTIONAL ALIGNMENT QA ITERATION SHIP READY REDUCE AMBIGUITY COLLABORATION WORKFLOWS ACCESSIBILITY TASK COMPLETION USER FLOWS INFORMATION ARCHITECTURE ERROR STATES EMPTY STATES FORM VALIDATION USER SATISFACTION COGNITIVE LOAD