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From: Linda Dressel Date: Thursday, November 20, 2014 at 4:56 PM To: Denise Taylor Cc: Linda Dressel Subject: visits with both UVIS and IR

Denise, Regarding PCs deciding if a resubmitted visit needs a new review, we have a couple of concerns about visits the use both WFC3/UVIS and WFC3/IR: We have been trying to reduce the number of switches between WFC3/UVIS and WFC3/IR within a visit. We prefer to set a limit of one switch per visit to avoid excessive use of the channel select mechanism, so a new review is needed if excess switching is introduced. Switching the order of WFC3/UVIS and WFC3/IR exposures in a visit can be a concern for persistence checking, since WFC3/IR exposures near the end of the visit can be a concern for the following visit if it uses WFC3/IR. If the order is switched, the reviewer should therefore reconsider whether the schedulers should be warned about the visit. Regards, Linda