Again, the most significant differences based on the level of family influence could be found within the medium-sized firms group. We could observe a significant difference in the use of only four operational planning instruments in medium-sized firms. Among those, all forecasts related to the P&L, the balance sheet and liquidity showed a significant relationship to the SFI score of medium-sized firms. Thus, the interpretation can be drawn that medium-sized firms that have higher levels of family influence focus less on the planning of P&L statements, balance sheets and liquidity. Overall, the results on several operational and strategic instruments reconfirm our findings described above, namely that significant differences in the use of MA practices based on the level of family influence can rather be detected in medium sized firms than in large firms.