Departmentation by function is the most suitable type of departmentation for organizations operating in a stable environment. This type of departmentation involves grouping employees based on their common skills, expertise, and functions within the organization.

Advantages of Departmentation by function:
1. Specialization and expertise: Employees within each functional department develop specialized skills and knowledge in their respective areas, leading to increased efficiency and effectiveness in performing their tasks. This specialization allows employees to become experts in their specific functions, leading to better performance and outcomes.

2. Efficient use of resources: Departmentation by function allows for the efficient allocation and utilization of resources within the organization. Resources such as equipment, technology, and personnel can be shared and coordinated within each functional department, resulting in cost savings and better resource utilization.

3. Clear career paths: Departmentation by function provides clear career paths for employees within the organization. Employees can develop expertise and advance within their functional areas, leading to increased job satisfaction and motivation. This can also promote employee retention and reduce turnover.

4. Effective coordination and communication: Functional departments facilitate effective coordination and communication within the organization. Since employees within each department share common goals and responsibilities, it becomes easier to coordinate activities, exchange information, and make decisions. This ensures smooth workflow and enhances overall organizational efficiency.

5. Easy control and supervision: Departmentation by function simplifies the control and supervision of employees within the organization. Managers responsible for each functional department can focus on specific tasks and responsibilities, making it easier to monitor and evaluate performance. This allows for timely feedback and corrective measures to be implemented when necessary.

6. Flexibility: Functional departments can adapt to changes in the external environment more easily compared to other types of departmentation. This flexibility allows organizations to respond quickly to market changes, technological advancements, and customer demands, ensuring long-term sustainability and competitiveness.

In conclusion, departmentation by function is the most suitable type of departmentation for organizations operating in a stable environment. It provides several advantages such as specialization, efficient resource utilization, clear career paths, effective coordination and communication, easy control and supervision, and flexibility. These benefits contribute to the overall success and performance of the organization.