Businesses would like their employees to write without language usage errors, so they arrange to have workshops on grammar to train their staff. However, a workshop simply will not teach business people how to overcome problems in their language usage.
This is a position statement by the National Council of Teachers of English: "This resolution was prompted by the continuing use of repetitive grammar drills and exercises in the teaching of English in many schools. Proposers pointed out that ample evidence from 50 years of research has shown the teaching of grammar in isolation does not lead to improvement in students' speaking and writing, and that in fact, it hinders development of students' oral and written language."
(On Grammar Exercises to Teach Speaking and Writing. NCTE Position Statement. http://www.ncte.org/about/over/positions/category/gram/107492.htm.)
For employees to learn how to avoid language usage problems, they must learn how to correct errors over time by having a trainer show them the errors in their own writing samples and help them understand how to write correctly in the context of their own writing.
Our Basic Grammar Skills Tutorial course teaches the skills over time focusing on the trainee's own writing. We no longer give workshops in grammar because we have found that one-on-one training in the individualized course is very successful in teaching the skills.
Read about the course here: http://writingtrainers.com/center/bwc110.htm.
(Outside US) 309 452-2831