# Implementation science > Implementation science studies how evidence-based therapies, guidelines and practices are adopted, delivered and sustained in real-world healthcare settings. Source: https://www.visfo.health/glossary/implementation-science Updated: 2026-08-16T21:55:02.284227+00:00 What is implementation science? Implementation science is the study of the barriers and facilitators that affect whether new therapies, clinical guidelines or other evidence-based interventions are adopted and integrated into routine care. It examines not only whether an intervention works, but also what helps or prevents healthcare professionals, organisations and patients from using it in practice. The discipline evaluates approaches such as educational programmes, organisational change, clinical workflow redesign and [patient engagement](/glossary/patient-engagement) tools. Its purpose is to bridge the gap between research findings and consistent, sustainable delivery in real-world healthcare settings. Why does implementation science matter in medical affairs? An effective treatment cannot benefit patients if it is not prescribed, delivered or used appropriately. Adoption may be limited by gaps in clinical knowledge, unclear responsibilities, unsuitable pathways, operational pressures, access constraints or differences between the studied population and local practice. Implementation science helps medical affairs teams identify these issues and design evidence-based support rather than assuming that publication or education alone will change practice. The findings can inform medical education, field medical activity, stakeholder engagement and evidence planning while maintaining the distinction between scientific exchange and commercial promotion. How is implementation science run in practice? Teams first define the practice gap, the evidence-based intervention and the setting in which adoption is expected. They then investigate barriers and facilitators through methods such as interviews, surveys, observation, pathway analysis, service data and literature review. [Stakeholder mapping](/glossary/stakeholder-mapping) can clarify which clinicians, patients, managers, payers and service leaders influence implementation. An implementation strategy is then selected and tested. This might involve education, decision support, local champions, revised referral processes, audit and feedback, or patient support. The strategy should be adapted to the setting without changing the essential clinical components of the therapy or intervention. Teams monitor delivery, learn from variation between sites and refine the approach where necessary. How is implementation success measured? Measures depend on the implementation objective. Common outcomes include whether the intervention is accepted, adopted and delivered as intended; whether it reaches the relevant population; whether it is feasible within existing workflows; and whether use is sustained. Teams may also examine implementation costs, unintended consequences and differences between sites or patient groups. These outcomes are distinct from clinical effectiveness, although both may be assessed together. A therapy may improve outcomes when used correctly but still have poor reach or adoption. Conversely, high uptake does not prove that the therapy produces the expected clinical benefit. Good evaluation therefore measures both implementation and relevant service, patient or clinical outcomes. Who is responsible for implementation science in a pharmaceutical organisation? Responsibility is usually shared. Medical affairs may define the scientific question, engage clinical stakeholders and translate findings into education or evidence plans. Health economics and outcomes research, epidemiology and real-world evidence teams may lead study design and analysis. Patient teams, market access, regulatory, safety and commercial colleagues may contribute within their respective governance boundaries. Healthcare organisations and patients must also be involved because implementation occurs within care systems, not within the pharmaceutical company. Clear ownership, documented objectives and early agreement on permitted activities help prevent fragmented programmes or solutions designed without sufficient understanding of local practice. How does implementation science differ from evidence generation and stakeholder engagement? Implementation science focuses on how evidence-based practice is adopted, delivered and sustained. An [evidence generation programme](/glossary/evidence-generation-program) develops evidence to answer defined clinical, economic or access questions; implementation science may use that evidence but asks what is needed for it to change routine care. Stakeholder engagement and patient engagement are methods that can support implementation, not substitutes for the discipline. They identify needs, perspectives and influence, while implementation science provides a structured way to diagnose the practice gap, select strategies and evaluate whether change occurred. It therefore sits between evidence generation, behaviour change, service improvement and real-world evaluation.