What are the most effective strategies to develop a PTO...

What are the most effective strategies to develop a PTO policy specifically designed for companies of varying sizes - small, medium, and large? Additionally, how can this policy be customized to suit different industries and sectors? Furthermore, what factors should be taken into account when implementing a PTO policy for multi-national, cross-functional, and remote teams, and how can this policy be effectively communicated to a diverse workforce, including immigrants and non-native employees?