Chris Carlson/AP

Electors from the 50 states will convene in their state capitols Monday and cast their votes for president. Republican Donald Trump is assured of a victory unless there is a massive, and totally unexpected, defection by the electors who are pledged to support him.

Here are five things you should know about the Electoral College:

1. How do you get to be an elector?

The Constitution leaves it up to each state to select its electors, but “there are two main ways,” said George Edwards, a distinguished professor of political science at Texas A & M University:

One — is at state party conventions, when party members select a slate of electors, often party officials, almost always party insiders. That’s how Jonathan Barnett was chosen. He’s a Trump elector in Arkansas, and was elected during his state party convention in August. Barnett believes that, as a former state representative and national GOP committeeman, he was chosen because of his “dedication and loyalty to the party, and history with the party as a known factor.”

That last point is important, because, he said, his phone has been ringing off the hook with people opposed to Trump, calling to plead with him to vote for someone else.

“Absolutely not” going to happen, he said.

Two — The alternative to being selected at a state party convention is being chosen by the party’s central committee or otherwise qualifying. Karen Packer is a Democratic elector in Oregon, automatically chosen by virtue of her position as state party first vice chair.

She said she is “very honored” to be an elector even if in a losing cause. She said she has a certificate “suitable for framing” and signed by the Oregon secretary of state. Oregon’s seven electors will cast their ballots in the state Senate chamber in Salem.

2. Are electors legally bound to vote for their party’s nominee?

Some states have passed laws to prevent so-called “faithless electors” from straying from their party’s nominee. In other states, parties require electors to sign pledges of their loyalty. But Edwards isn’t sure the state laws, which have not been challenged, would hold up in court. He believes they’re unconstitutional, because, he said, “the constitution gives electors the right to exercise discretion.”

In fact, he said, the founders expected electors to act independently, as there were no political parties as we know them. He notes that electors were chosen by state legislatures until the 1830s.

3. Can anyone become an elector?

Yes, except for federal officeholders, such as members of Congress or the executive branch. The states are required to submit “Certificate(s) of Ascertainment” listing their electors by Dec. 19th, to the Office of the Federal Register, which administers the process.

4. So the electors meet in their state Capitols Monday and cast their ballots for president. Then what?

The states then submit a Certificate of Vote to the Federal Register, listing each person who received a vote for president and for vice president. They are to be six such certificates in each state, signed by each of that state’s electors.

Two of the certificates are then to be sent to Washington, with a copy to the vice president, in his role as president of the Senate, and to the National archivist. (They have to be received in Washington by the president of the Senate and Archivist by Dec. 28. See other key dates and processes here from the National Archives and Records Administration.)

On Jan. 6th, the votes will be formally tallied before a Joint Session of Congress — and assuming someone gets a majority of electors, 270, we’ll officially know our next president.

5. This seems to be a pretty convoluted way of choosing a leader, isn’t it?

Professor Edwards certainly believes so. “It’s a bizarre way of doing things,” he said.

There are efforts to change it, especially after this past election, which saw the winner of the popular vote lose the election for the second time in the last five elections. The National Popular Vote proposal would guarantee the winner of the popular vote is the winner of the presidency. It needs support from enough states to add up to 270 electoral votes. It has so far been enacted by 11 jurisdictions with 165 electoral votes.

But is unlikely to adopted by a majority of states any time soon.