What items did Lewis and Clark bring with them? What is the difference between estimated and actual costs? Objective Objectives: Students will be able to: • List ten items the members of the Lewis and Clark Expedition took with them. • Identify ten items needed for a field trip [possibly to Fort Clatsop]. • Understand the difference between estimated and actual costs. • Compare Lewis and Clark’s estimate of expenses with the actual cost of the expedition. Background Meriwether Lewis and Thomas Jefferson made a list of supplies and equipment needed for the expedition and its cost. It was this e Duration: 90 Minutes.