"The more electronic and global we get, the less important the spoken word has become, and in e-mail clarity is critical," said Sean Phillips, recruitment director at another Silicon Valley corporation, Applera, a supplier of equipment for life science research, where most employees have advanced degrees. "Considering how highly educated our people are, many can't write clearly in their day-to-day work."

Some $2.9 billion of the $3.1 billion the National Commission on Writing estimates that corporations spend each year on remedial training goes to help current employees, with the rest spent on new hires. The corporations surveyed were in the mining, construction, manufacturing, transportation, finance, insurance, real estate and service industries, but not in wholesale, retail, agriculture, forestry or fishing, the commission said. Nor did the estimate include spending by government agencies to improve the writing of public servants.

An entire educational industry has developed to offer remedial writing instruction to adults, with hundreds of public and private universities, for-profit schools and freelance teachers offering evening classes as well as workshops, video and online courses in business and technical writing.

Kathy Keenan, a onetime legal proofreader who teaches business writing at the University of California Extension, Santa Cruz, said she sought to dissuade students from sending business messages in the crude shorthand they learned to tap out on their pagers as teenagers.

"hI KATHY i am sending u the assignmnet again," one student wrote to her recently. "i had sent you the assignment earlier but i didnt get a respond. If u get this assgnment could u please respond . thanking u for ur cooperation."

Most of her students are midcareer professionals in high-tech industries, Ms. Keenan said.

The Sharonview Federal Credit Union in Charlotte, N.C., asked about 15 employees to take a remedial writing course. Angela Tate, a mortgage processor, said the course eventually bolstered her confidence in composing e-mail, which has replaced much work she previously did by phone, but it was a daunting experience, since she had been out of school for years. "It was a challenge all the way through," Ms. Tate said.

Even C.E.O.'s need writing help, said Roger S. Peterson, a freelance writer in Rocklin, Calif., who frequently coaches executives. "Many of these guys write in inflated language that desperately needs a laxative," Mr. Peterson said, and not a few are defensive. "They're in denial, and who's going to argue with the boss?"