The following is not a contingency factor in control:

Organisation growth

Organisation culture

Decentralised organisation

Organisation structure

The following is not a contingency factor in control:

Organisation growth

The contingency factor that is not related to control is organization culture. Both organization growth, decentralized organization, and organization structure can all impact control within an organization.

To determine which of the options is not a contingency factor in control, we need to understand what contingency factors are in the context of organizational control.

Contingency factors refer to the variables or factors that affect the design and implementation of control systems within an organization. These factors can vary across different organizations and industries.

Let's analyze each option:

1. Organization growth: This is a contingency factor in control. As an organization grows, it becomes more complex, and control systems need to adapt to address the additional challenges that come with growth.

2. Organization culture: This is also a contingency factor. The culture of an organization influences how control processes are established and enforced. Different cultures may prioritize different control mechanisms and values.

3. Decentralized organization: This is a contingency factor as well. The degree of centralization or decentralization within an organization affects how control systems are structured and implemented. In decentralized organizations, control may be more diffused across various departments or units.

4. Organization structure: This is the option that is not a contingency factor in control. While organization structure is important for many aspects of organizational management, it does not directly influence the design or implementation of control systems. Control systems can be configured differently within various organizational structures.

Therefore, the answer is "Organization structure" is not a contingency factor in control.