He’s working on an idea for a museum.

[diamondcutter]

He’s working on an idea for a museum.

Does this sentence mean he’s thinking about setting up a museum?

 

[Rover_KE]

It might mean that. In what context have you seen this sentence?

(Just click 'Thank' when you get a useful answer.)

 

[diamondcutter]

…
In 2000, Dr Ballard went to the Black Sea. But he didn’t want to find a ship. ‘We explored an area in the Black Sea,’ he says. ‘Thousands of years ago, there was land where there is water today. We found what we think is a site of human habitation down there. It may be 7,000 or 8,000 years old, and it was 100 meters under the sea.’ Dr Ballard and his team are looking for more things in the site, to find out about the people who lived there.

Dr Ballard is now working on another idea — the world’s first underwater museum. ‘There is more history down there in the sea than in all the museums of the world,’ says Ballard. …

The sentence below is one of the ‘true or false’ statements.

He’s working on an idea for a museum.

The sentence means he’s thinking about setting up a museum, doesn’t it?

 

[emsr2d2]

Dr Ballard is now working on another idea — the world’s first underwater museum.
He’s working on an idea for a museum.

The two relevant sentences are above, the first is from the piece and the second is one of the suggested True/False statements. It doesn't matter whether he's "thinking about setting up a museum" or not. What matters is whether or not the piece gives you the same information as in the True/False statement.