What are the characteristics and limitations of internal promotion and external recruitment of managers?

1. Managers are promoted from within, which has the advantages of quick entry into roles and strong adaptability to enterprises. Has the following advantages: (1) Familiar with the products, technologies and production processes of this enterprise; (2) Familiar with the history and management methods of this enterprise; (three) familiar with the personnel relations of the enterprise; (4) I have worked in this enterprise for several years and have made some contributions. Disadvantages: lack of education, knowledge and insight. 2. recruit from the outside, just the opposite. The advantage is that you can choose education, knowledge, qualifications and experience, but the disadvantage is also obvious: you are not familiar with the products, technology, production process, personnel and management methods of this enterprise, and it takes time to integrate into the team.