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It is useful to provide trial investigators, or their data contact, with a data transfer guide outlining how their IPD should be prepared and transferred securely (Table 4.3). In addition, the guide can be used to make data providers aware of how the central research team will subsequently manage, check and verify their data, and to encourage them to get in touch should any queries arise. It may also highlight whether there are any specific funds available to facilitate the preparation of trial data, and how to access these. If helpful, the guide can be accompanied by a template data file in the trial investigators preferred software package (such as Stata, R, SAS, or Excel), including all the variable names, but no actual data.