Please help me answer the following question

Question: Critically review arguments for and against the effectiveness of leadership and management development.

a) Provide Introduction (Defining leadership and Management and theirs importances) Explanations should be provided as many as possible with references from current years, 2019 onwards

b) Provide 6 arguments for leadership and management development with references from current years, 2019 onwards: Each argument with enough explanations

c) Provide 5 disadvantages and drawbacks of leadership and management development with references from current years, 2019 onwards: Each disadvantage and drawbacks with enough explanations