Apple Inc. is working on adding touch screens to its Mac computers, a move that would defy long-held company orthodoxy and embrace an approach that co-founder Steve Jobs once called “ergonomically terrible.” Apple engineers are actively engaged in the project, indicating that the company is seriously considering producing touch-screen Macs for the first time, according to people familiar with the efforts. Still, a launch hasn’t been finalized and the plans could change.

For more than a decade, the company has argued that touch screens don’t work well on laptops and that the iPad is a better option if someone wants a touch interface. Apple also has worried that touch-screen Macs could cannibalize iPad sales.

But rivals have increasingly added touch screens to computers, putting pressure on Apple to do the same. A Mac resurgence in recent years also has made the business a bigger moneymaker than the iPad — and the company wants to keep its computer lineup as compelling as possible.