The phrase "according to what specifications" is an expression of interest in the specific details of a given subject. It is a request for information about the requirements or criteria that must be met to achieve a particular goal or standard. There are several synonymous phrases that can be used to convey the same meaning as "according to what specifications." Some alternatives to consider include "as per the specifications," "in accordance with the requirements," "as dictated by the parameters," "following the guidelines," and "pursuant to the stipulations." Each of these phrases is useful for requesting specific information in a professional or academic context.