■ According to the proposal, if the Uber board seats currently held by three directors — Ryan Graves, Arianna Huffington or Wan Ling Martello — are vacated, Mr. Khosrowshahi gains the power to nominate directors for those spots. The new directors must be approved by a majority of the board and by a majority of all shareholders.

■ The plan also includes a proposal to remove the outsize voting power carried in two categories of Uber stock, the Class B common shares and the preferred shares. Class B common shares currently offer their holders 10 to 1 voting power, for example. But under the proposal, that would change to one vote per share. The change would diminish the power of some current shareholders, like Mr. Kalanick, as well as that of Benchmark and other venture investors.

■ The proposal also suggests that Uber elect only a few board members each year, in effect setting a cap. That would make it hard for an activist shareholder to take over the board.

■ One part of the proposal takes direct aim at Mr. Kalanick. The measure states that any person who has previously been an officer of Uber can return as chief executive only if he or she can get the approval of two-thirds of the board and 66.7 percent of all shareholders.

■ The proposed plan also imposes a 2019 deadline for Uber to go public. To ensure that the public offering happens at that time, there is a provision that if more than one third, but less than one half, of the board wants an I.P.O., they can add directors until they have the control over the board they need to make the public offering happen. This provision may be dropped.

■ The plan does allow Mr. Kalanick to keep his board seat, subject to the approval of Mr. Khosrowshahi. Of the two other board seats that Mr. Kalanick controls, one would be given to SoftBank while the other would be filled by the chief executive of a Fortune 100 company, if approved by the majority of the board and a majority vote of all shareholders. If for some reason Mr. Khosrowshahi rejected the proposed board member three times, he could designate someone for the third seat himself.