by the numbers

by the numbers idiom
In a strict sequence, step-by-step; also, mechanically. For example, The only way to assemble this computer is to do it by the numbers, or Writing a novel is not something one can do by the numbers. This expression has nothing to do with actual numerical figures (like by the dozen) but uses numbers in the sense of a strict order or sequence.

The American Heritage® Dictionary of Idioms by Christine Ammer. Copyright © 2003, 1997 by The Christine Ammer 1992 Trust. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

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