"By numbers" is a common phrase used to describe something that is done in a systematic or formulaic way. However, there are several synonyms that can be used to convey a similar meaning. For instance, "methodical" refers to a step-by-step approach, while "systematic" suggests a methodical or orderly process. "Structured" means something that follows a specific framework or organization. "Formalized" implies that a process has been made official and subject to specific rules or protocols. "Standardized" suggests a uniform approach to a task. Lastly, "algorithmic" implies a logical and mathematical method of achieving a desired outcome. By using any of these synonyms, a writer can convey a similar meaning to "by numbers".