A systematic review may include randomized controlled trials to be considered level 1 evidence on the Melnyk & Fineout-Overholt levels. They developed a system for assigning levels of the evidence hierarchy.
In nursing, a widely used system for assigning levels of evidence is derived from Melnyk and Fineout-Overholt's book.
B. Mazurek Melnyk and E. Fineout-Overholt developed the 'Advancing Research and Clinical practice through close Collaboration' model, which can be used to sustain the evidence-based practices in the healthcare systems.
Moreover, a randomized controlled trial is a type of experimental design where the sample to be used is selected at random from the eligible (target) population.
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