Research on executive coaching has grown rapidly, especially in the fields of management consulting, training and development of employees. Recent research on executive coaching has led to the implementation of executive coaching by using the method of multi source feedback (MSF), because MSF has advantages over single-source feedback. However, previous studies have not considered   leadership style that can affect executive coaching in an effort to improve employee performance.

This study aims to determine (1) the impact of executive coaching intervention with multisource feedback on the behavioral performance of sales staff; (2) the effect of leadership style with multisource feedback on the behavioral performance of sales staff; (3) the influence of the leadership style in executive coaching with multisource  feedback on the behavioral performance of the sales staff.

This research uses experimental design method (field experiment), which deploys a 2x2 factorial design with the first level is executive coaching (coaching vs no coaching) and the second level is the type of leadership (transformational vs. transactional). Participants in this experiment amounted to 100 sales staff of one multinational automotive company in Indonesia. Participants in this research are randomly classified into 4 groups of manipulation condition. The hypothesis in this research are tested using Analysis of Variance (ANOVA), which comparing the results of manipulation in the experimental group and control group.

The study found that: (1) the behavioral performance of sales staff  with MSF executive coaching better than the sales staff without executive coaching; (2) the behavioral performance of sales staff with the transformational leader is better than the performance of sales staff with the transactional leader; and (3) The existence of executive coaching with the type of transformational leadership may improve the behavioral performance of Sales staff. Originility value of this research is that this research seeks to develop a model of executive coaching with MSF to include therein a variable  of leadership style to maximize the impact of multisource feedback in executive coaching.