The answer is Employee handbook.
A letter from the CEO typically addresses specific issues, updates, or messages from the CEO to the employees or stakeholders. It is not a comprehensive document that outlines the overall business conduct, mission statement, procedures, guidelines, and policies.
A case-specific handbook is usually tailored to address particular situations or cases within a company. It does not cover the overall business conduct or the company's mission statement, procedures, guidelines, and policies.
A job aid is a tool or resource designed to help employees perform specific tasks or functions. It is not a comprehensive document that includes the company's mission statement, procedures, guidelines, and policies.
An employee handbook is a comprehensive document that outlines the company's mission statement, procedures, guidelines, policies, and how overall business should be conducted. It serves as a reference for employees to understand the company's expectations and standards.