计划 (jì huà) is the most general word for 'plan' in Chinese, used as both a noun (a plan) and a verb (to plan). It is broader than 设计 (design a specific thing), 方案 (a concrete proposal), 策划 (organize an event), 规划 (long-term systematic planning), and 筹划 (prepare logistics). Use 计划 for everyday planning like making a schedule or a project plan.