What outcome do you want from your consultation?  This depends a bit on where you are in the process.

In the design stage, you want an efficient design in terms of time and money that takes subject knowledge into account and that will answer your research question with a high degree of probability.

If you are planning the design, here is what you want to get as an outcome from the statistical consultation or perhaps over several consultations:

• A design that addresses your research hypotheses.

• Alternative designs that also address your research hypotheses.

• An outline of how to carry out the design.

• The basic outline of the statistical analysis that will be performed  on the data.

If you are at the end, you essentially want a statistical analysis plan.

• Statistical analysis plan.

• Implementation details such as the packages to be used or the  programming language to be used.

You might also want help performing some specific statistical analysis or several statistical analyses.  This could take the form of coaching to perform the analysis yourself, giving you some code snippets so you can do the coding yourself, or even carrying out a limited bit of analysis that you can then plan to extend or repeat cookie-cutter fashion.

If you are being coached, you probably want the statistical analysis exactly specified so you can do the work correctly.

Or, you may want the statistician to actually perform the statistical analysis for  you.  Then, you should plan to have:

• An estimate of the billable time as well as the calendar time that  will be needed.

• An agreement on what communication needs to take place and when,  such as handing off finalized data sets.

• The actual statistical analysis output result.

• Ideally, the code that was used to produce the analysis.

• A copy of the data that were actually analyzed.

• An outline or synopsis of the results at a minimum.

• Some sample verbiage for the Statistical Methods section, the  Results section, and potentially the Discussion section.