Study Selection and the process you follow during this step is another key aspect of Systematic Reviews. This step, your planning for it, and your adherence to your a priori designed protocol and inclusion/exclusion criteria for study inclusion and exclusion are all part of what makes this a *systematic* and comprehensive review of the literature on your focused research question.
Key components and process for Study Selection:
All Results: Start with your library of all your search results (export a back up copy of the library at this stage so you have it in case)
Consider a citation manager tool to make this easier
Duplicates: Identify and remove duplicate references (citation managers all have a method to help you identify duplicates and select the one to keep) *Be sure you do follow through checking in this step - sometimes something may be identified as a duplicate when it's not
Consider a citation manager tool to make this easier
Record the number of duplicates for your PRISMA diagram
Title Abstract Screening: export your results to a spreadsheet with columns for Year, Title, Abstract, and Decisions: Yes, No, Maybe, and Notes
Consider Abstrakr or another SR Software & Tools option to make this process easier
Distribute to Reviewers: send result sets to your reviewers, confirm they have the inclusion / exclusion criteria sheet you've agreed to follow
Consider Abstrakr or another SR Software & Tools option to make this process easier
Collate Results: when reviewers return results, compare and group Yes/Yes, No/No, and identify items needing consensus or 3rd review
Conduct 3rd review / consensus process for disagreement items
Record your included studies at this point
Move on to Full Text review: send result sets to your reviewers, confirm they have the inclusion / exclusion criteria sheet you've agreed to follow
Collate Results: when reviewers return results, compare and group Yes/Yes, No/No, and identify items needed consensus or 3rd review
Conduct 3rd review / consensus process for disagreement items
Record your final included studies at this point
Move on to Critical Appraisal