Clinical practice guidelines (CPGs) are systematically developed statements that assist clinician and patient decisions about appropriate healthcare for specific clinical circumstances. At the NP level, guideline application requires understanding evidence hierarchies (systematic reviews/meta-analyses > RCTs > cohort studies > case series > expert opinion), the GRADE system for rating quality of evidence and strength of recommendations, and the distinction between strong recommendations ('should do') versus conditional recommendations ('consider doing'). The NP must critically appraise guideline quality using validated tools like AGREE II (Appraisal of Guidelines for Research and Evaluation), identify potential conflicts of interest in guideline development panels, and recognize that guidelines are not cookbook medicine — they must be integrated with clinical expertise and patient values/preferences. Implementation science principles inform how guidelines are translated into practice: identifying barriers (knowledge gaps, system constraints, resource limitations), selecting implementation strategies (clinical decision support, order sets, audit and feedback), and measuring outcomes (process measures, clinical outcomes, balancing measures). The NP leads quality improvement initiatives using Plan-Do-Study-Act (PDSA) cycles, interprofessional education, and evidence-based protocol development to close the evidence-practice gap.