In all five regressions, the level of family influence was included in the final model, which highlights the importance of this covariate and confirms our findings based on the uni variate analyses. Besides the level of family influence, firm size was also included as a predictor of the establishment of discrete MA departments, heads of MA that have university training and the number of strategic MA instruments used. Moreover, firm size acts as the strongest predictor of the establishment of discrete MA departments and the number of strategic MA instruments used. Surprisingly, industry sector was included as the most important predictor of the number of operational planning instruments used, which can be interpreted as industrial
firms using significantly more operational planning instruments than do non-industrial firms.