Systematic Review Process:
Evidence syntheses projects (including systematic and scoping reviews) are labor intensive.
Writing the systematic review protocol may take 2-6 months and completing and writing a systematic review may take 1-2 years.( Cochrane Collaboration, Cochrane Community, Review Production. Time and Commitment.)
A study of registered systematic review protocols found that the mean time taken to complete a systematic review was 1.5 years. (Borah, R., Brown, A., Capers, P., & Kaiser, K. (2017). Analysis of the time and workers needed to conduct systematic reviews of medical interventions using data from the PROSPERO registry. BMJ Open, 7(2), E012545.)
A study on scoping reviews found a mean time of 5.2 months to complete a scoping review, while the high of the range was over 1.5 years. (Pham, M., Rajić, A., Greig, J., Sargeant, J., Papadopoulos, A., & McEwen, S. (2014). A scoping review of scoping reviews: Advancing the approach and enhancing the consistency. Research Synthesis Methods, 5(4), 371-385.)
| Steps in traditional systematic review | Estimated time investment |
| 1. Assemble evidence synthesis review team and select project manager | Varies |
| 2. Identify appropriate review methodology | 2 weeks |
| 3. Define research question | 2 weeks |
| 4. Define inclusion/exclusion criteria | 1 week |
| 5. Select databases | 1 week |
| 6. Select grey literature resources | 1 week |
| 7. Write search strategy for "master" database |
1 week |
| 8. Write and register protocol (written compilation of previous steps) | Varies |
| 9. Translate search strategy to syntax of all databases (including grey literature) | 2 weeks |
| 10. Search and export results into citation management software | 2 weeks |
| 11. De-duplicate results | 2-4 weeks |
| 12. Title and abstract screening | 2-3 months* |
| 13. Retrieve full-text articles | 1 month* |
| 14. Full-text screening | 2-3 months* |
| 15. Risk-of-bias assessment | 2-3 months |
| 16. Data extraction | 2-3 months |
| 17. Meta-analysis or synthesis of results | 2-3 months |
| 18. Write the manuscript | 2-3 months |
*Time frame can vary significantly depending on the number of citations identified during screening
Steps and estimated time informed by Cornell University Library
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