What is primarily not required except for referee purposes in the verification of dimensions?

The dimension stated in the document is primarily not required except for referee purposes in the verification of dimensions. In the context of IPC-A-610, the focus is predominantly on ensuring that the assembly meets the standards for quality and acceptability based on specific criteria that are more operational and practical rather than merely adhering to the dimensions outlined in documentation.

The other choices involve aspects directly tied to the physical assembly and manufacturing processes. Specific part mountings and measurements of solder fillet dimensions are critical for ensuring that components are properly placed and that connections are reliable. Average percentages for parts also typically relate to performance metrics that would be necessary for maintaining quality standards. In contrast, the dimensions stated in documents serve more as a reference point and can be used in disputes or clarifications, rather than being directly required for operational verification. This emphasizes the importance of practical measurements that directly influence assembly quality over purely documentary specifications.