Abstract
Managerial decision and its effectiveness are regarded as one of the most practices of the manager if not its essence. Thus, the present study aims at recognizing how a managerial decision is effective and what are its determinants, the internal determinants in particular. To achieve this, a questionnaire form was designed and distributed to a sample of managers in both administrations, the middle and the executive in Ninevah health center reached (50) subjects out of a population of (75). After the theoretical framework has been touched upon through the keywords ( the internal environment, the managerial decision, and the effectiveness of the managerial decision); the required data were obtained and analyzing their content by applying the statistical program(SPSS) and through (ANOVA, ONE TEST SAMPLE) several findings resulted in the following conclusions: No effectiveness of the taken managerial decision has been found; besides (the organizational structure flexibility, communications and the organizational culture) are considered determinants of the managerial decision effectiveness. Several proposals were presented to pass over these conclusions, the most important of which are seeking the participation of the relevant employees at taking decisions in order that its quality and reliability be guaranteed
