In any organisation, a variety of functions are carried out in order to do business. In larger organisations we have different types of managers who are responsible for different areas. For example you may have an Human Resources manager who is responsible for planning, organizing, activation and control specific to the companies manpower needs.
My retired father wrote a training manual for managers many years ago. He worked in HR for most of his adult life. The company he wrote the manual for no longer exists and my dad gave me permission to use his manual in my posts. I had to translate, break down and make it less formal so that it is suitable for a blog. I hope the essence is still the same.