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Systematic Reviews & Evidence Synthesis

Learn about the systematic review and evidence synthesis process

Systematic Review Process & Timeline

Systematic reviews require time and effort to complete. It should not be expected to be complete a systematic review in a matter of months. An average time to complete a systematic review is between 12-18 months. The Cochrane Handbook for Systematic Reviews of Interventions suggests the following timeline to complete a review:

Month

Activity

1 - 2 

Preparation of protocol

3 - 8  

Searches for published & unpublished studies

2 - 3  

Pilot test of eligibility criteria

3 - 8

Inclusion assessments

Pilot test of ‘Risk of bias’ assessment

3 - 10

Validity assessments

Pilot test of data collection

3 - 10

Data collection

3 - 10

Data entry

5 - 11

Follow up of missing information

8 - 10

Analysis

1 - 11

Preparation of review report

12 -

Keeping the review up-to-date

Cochrane Handbook for Systematic Reviews of Interventions Version 5.1.0 [updated March 2011]. The Cochrane Collaboration, 2011. Available from https://training.cochrane.org/handbook/current