In this short video Michael Quinn Patton outlines the differences between developmental, formative and summative evaluation.
Patton describes developmental evaluation as evaluation for a developing or emerging initiative while summative and formative evaluation can be used to examine established programs. Summative evaluation measures outcomes against pre-determined goals and frameworks while formative evaluation can assist in continuous improvement.
He also also outlines the particular circumstances where development evaluations can add value - in complex situations where the knowledge base is not well established.
Patton, M. Q. (2009). Developmental evaluation as alternative to formative assessment. [Web Video]. Retrieved from http://www.youtube.com/watch?feature=player_embedded&v=Wg3IL-XjmuM
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