When considering a situation, the phrase "on a case-by-case basis" may be used to indicate that each instance will be evaluated individually. However, there are several other ways to express this concept. "Individually assessed" or "examined on an individual basis" could convey a similar meaning. Another alternative could be "judged on a per case basis" or "considered separately for each occurrence." Additionally, "tailored to each situation" or "determined on a custom basis" might work. Regardless of the phrasing used, the idea remains the same - each circumstance will be evaluated uniquely and with care.