An expedition is different from other forms of overnight wilderness travel in that it involves extended time and distance in the field; it is beyond the reach of immediate rescue; and the party is self-contained regarding gear, provisions, and decision-making responsibilities. Successful expeditions may prove to be powerful, life-changing experiences. Conversely, failed expeditions may be destructive to participants' physical, psychological, or spiritual well-being. The planning phase is essential in determining which of these outcomes will prevail. Expedition planners should arrange to keep their group safe; avoid degradation of wild lands and waterways; and achieve a fulfilling, exciting adventure. Two lists are presented to assist planning. List 1, preparation activities, addresses selecting an activity, a location, and companions; holding meetings to develop goals and plans; assuring safety; arranging finances; gathering information; gathering equipment; assuring access to drinking water and food supplies; practice and trouble-shooting; and arranging transportation for people and gear. List 2, equipment groups, is prefaced with advice to apply the "Is this really needed?" test when selecting gear. Considerations covered by this list include food and water; clothing; shelter; activity items; safety; hygiene; environmental protection; critical papers such as money, travel documents, and permits; entertainment and comforts; and transportation. Two additional, essential things to take on every expedition are good judgment, which can be developed and improved through practice, and common sense, which should not be assumed to be pervasive within the group. (TD)