ATP 2-01 establishes doctrine for the specific tasks under planning requirements and assessing collection. It expands on the principles in FM 3-55. ATP 2-01 should be used in conjunction with FM 3-55 and with FM 2-0. Readers should be familiar with fundamental doctrine contained in ADPs 2-0, 3-0, 5-0, and 6-0 and ADRPs 2-0, 3-0, 5-0, and 6-0. ATP 2-01 establishes doctrine for the specific functions under planning requirements and assessing collection. It expands on the principles in FM 3-55. ATP 2-01 should be used in conjunction with FM 3-55 and with FM 2-0. It outlines the preparation of planning requirements tools during the conduct (planning, preparation, execution, and assessment) of operations. This publication provides details on the four continuing functions of planning requirements and assessing collection. It includes techniques for developing planning requirements tools and keeping them current throughout an operation. It addresses factors to consider when supporting offensive, defensive, and stability tasks. It also discusses considerations when operating in urban and nontemperate environments. Although the discussions and descriptions in this manual may seem linear, planning requirements and assessing collection is a dynamic, continuous, and interactive process requiring constant interaction between the commander and staff. Depending on the mission, time available, ongoing operations, and standard operating procedures (SOPs), units may develop techniques for abbreviated information collection planning to meet the commander's needs. The information presented is descriptive, not prescriptive or restrictive. However, it describes the optimal process. This manual complies with Doctrine 2015 guidelines. Chapter 1 discusses information collection and its tasks-planning requirements and assessing collection, task and direct collection, and execute collection-across the echelons and the vital role of the commander and staff. It also addresses the linkage between planning requirements and assessing collection, the military decisionmaking process (MDMP), intelligence preparation of the battlefield (IPB), and targeting. Chapter 2 describes how the commander provides the staff with inputs necessary to perform planning requirements and assessing collection and how the staff develops their respective running estimates, requests for information, and requirements. It also outlines the functions of planning requirements and assessing collection. Chapter 3 discusses the development of requirements-the identification, prioritization, and refining of gaps in data and relevant information-and knowledge concerning the operational environment that must be resolved for the commander to achieve situational understanding. Chapter 4 describes the development of planning requirements tools. These tools, developed by the intelligence staff, begin the process of synchronizing the information collection plan with the scheme of maneuver and are updated as the scheme of maneuver changes. Chapter 5 discusses assessing the information collection plan, providing feedback to information collection assets, and retasking of assets. Chapter 6 discusses the process of updating planning requirements tools and updating or revising the information collection plan to remain synchronized with operations. Chapter 7 discusses the considerations for planning requirements and assessing collection when conducting offensive, defensive, and stability tasks. Chapter 8 discusses the considerations for planning requirements and assessing collection for urban, mountain and cold weather, jungle, and desert environments. Appendix A discusses joint, national, and multinational intelligence, surveillance, and reconnaissance (ISR) planning considerations. Appendix B provides tactics, techniques, and procedures for requesting aerial collection.