What an effective development plan should contain and the length of time it should cover?

An effective development plan should include clear goals and objectives, a timeline for achieving those goals, the resources required, and metrics for measuring progress. It should also outline potential challenges and strategies for overcoming them. Typically, a development plan should cover a timeframe of one to five years, allowing for both short-term and long-term growth and adaptation. This timeframe provides enough flexibility to adjust as circumstances change while maintaining focus on strategic outcomes.