Two things: legal time to assess the assignment against both categories, and preparation work to reconstruct technical evidence that a purely managerial file would never have needed. Ask for the scope in parts so the business can decide how much archival digging it wants before counsel makes the call.
Fund the duty statement first
The cheapest sequence is to pay for a solid written assignment description early, because it narrows the analysis and prevents evidence gathering aimed at a category that will not be used. Ask what happens to the fee if the review concludes the assignment does not support the intended classification. Official charges should be confirmed at the time of each step rather than budgeted from an old figure.
Pay for a solid written assignment description early, because it narrows the analysis and prevents evidence gathering aimed at a category that will not be used. Two costs follow from having two possible categories: legal time to assess the assignment against both, and preparation work to reconstruct technical evidence a purely managerial file would never have needed. Ask for the scope in parts so the business can decide how much archival digging it wants before counsel makes the call, and ask what happens to the fee if the review concludes the assignment does not support the intended classification.
Confirm official charges at the time of each step.