To become a skilled carpenter training is essential. It can be acquired informally through "learning-by-working;" through company on-the-job training programs, by attending trade or vocational/technical schools; through unilaterally (management or labor) sponsored trainee programs; through registered labor-management apprenticeship programs, or a combination of the above. It is generally accepted that the more formalized training programs give more comprehensive skills training. Recommended high school courses include algebra, general science, mechanical drawing, English, blueprint reading, and general shop.