Why It Matters
Research shows that the effectiveness of many interventions depends not just on what is delivered, but how much of it participants receive. Too little dosage may result in minimal change, while an overly intensive dosage can overwhelm participants or strain staff capacity. Clear dosage expectations help organizations plan staffing, timeline, and resources—and allow evaluators to understand whether a program was implemented as intended.
Who Should Know This
- Program designers deciding the structure of activities
- Frontline staff delivering services
- Evaluators assessing program fidelity and outcomes
- Funders reviewing program quality and evidence
Real World Examples
- A tutoring program provides students with three one-hour sessions per week for 12 weeks, which research shows improves reading comprehension.
- A parenting class series requires ten weekly two-hour sessions to ensure parents receive the full curriculum.
