Best Practice

Show dimensions in an organized way, and ideally corresponding to actual location from which a person would measure. This makes the tech drawing highly functional, as opposed to requiring a lot of parsing of information.
Show minimum required information to eliminate time spent on irrelevant information
Create user-specific tech drawings. Someone with experience will likely require less information.
Show additive dimensions (length of 132" when 89 and 43 were already measured) only if they are obviously useful for quality control.
Distinguish quality control measurements from functional measurements
Use fiducials in priority over actual dimensions, unless dimensions are required (for quality control or other purposes)
Include quality control information
Number your callouts to help in tracking of the callouts

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