In the Voya retirement plan, there are 33 funds. See below for a snapshot. First, look at the asset class, which tells you what type of fund it is. Stability of principal is a money market fund. Second, review the 10 year average. Although past performance does not guarantee future results, you can see that the return has been a little more than 0.5%. Finally, look at the Net Fund Exp %, which is the fee you pay for investing in the fund. For the BlackRock Liquidity, your annual return would have been 0.34% (0.51 (return-expense 0f 0.17). Therefore, due to a low return and high fees, putting money in this asset class is not part of how to invest in 403b strategy.