The process of evaluating the submitted manuscripts with the help of subject experts in the concerned research area is called as peer review. This step is essential and serve as a quality check for the article before publication.
Research outcome may or may not be predictable or can or can't be expected to be so and so. It depends upon the research area and the depth of investigation. It is difficult to expect outcome of researchers who strive to do original research. On the other hand, outcomes of many routine research works done by academic institutions may be predictable.
Similar works from researchers across the globe is also required in a particular area or topic to establish a technical fact.