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Sampling
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Comparison of yields from exhaustive versus comprehensive sampling [32]. Informed matching of sampling to search methods to synthesis approaches
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Sources
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Audits of relative yield [77]
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Structured questions
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Exploration of techniques for automated document clustering to provide initial overview of available evidence across a broad range of topic areas [140, 141]
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Search procedures
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More empirical testing of different approaches to searching [142, 143]. Exploration of iterative and theory-based approaches [41]
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Search strategies and filters
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Ongoing rigorous development of methodological filters comparing parsimonious and exhaustive lists. Filters for different qualitative study types [34], process evaluations and mixed methods studies [21, 44]. Search strategies by discipline (e.g. social work), by application (e.g. patient satisfaction) or for theories
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Supplementary strategies
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Audits and evaluations of relative yield [16]
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Standards
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Development of consensual reporting standards for QES iterative search approaches; audits of reporting standards generally and for specific methods; standards to handle [39, 84]
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