Describe 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, actionable steps to achieve those goals, a timeline for completion, and metrics for measuring progress. It should also identify necessary resources, potential challenges, and strategies to overcome them. Typically, such a plan covers a timeframe of 1 to 3 years, allowing for both short-term and long-term development while remaining adaptable to changing circumstances.