Prime Minister Ehud Olmert is one of the last government officials to appear before the Winograd Commission on Thursday, which is investigating actions taken during the war in Lebanon.
Olmert spent most of Wednesday preparing his testimony with his attorneys.
Olmert is expected to appear before the commission for only one day and refrain from casting the blame on others.
The prime minister will present the decision-making process that led to the cabinet vote in favor of going to war, explain how he made his decisions during the war, and upon what information they were based.
Former Chief of General Staff Lt.-Gen Dan Halutz and Defense Minister Amir Peretz have already appeared before the commission.
The commission is scheduled to present an interim report by the end of February, which will be available to the public.