Define reach, dose, and intensity as they relate to interventions being considered within program ...

-    The reach of an intervention concerns what proportion and which particular segments of an intended target population receive the interventions. CHN e.g., a PSA intended for all seniors will only reach those with a TV/radio.
-    The dose is the amount of intervention required to have an effect. CHN e.g., multiple exposures to a PSA are required to change awareness.
-    The intensity of the intervention refers to its quality and whether it is tailored to the population subgroup receiving the information. CHN e.g., a media campaign for seniors on the importance of walking has low relevance for seniors with impaired mobility. (page 278)
Chapter 15: Information Technology

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