As a starting point look at IPC J-STD-001E, Section 11.2.2.1, Table 11-1. After many joint discussions and never seeing eye to eye, the need is there but the vision lacks scope. If you are lucky Chris Mahanna may lend some clarity to this issue. 
Dewey

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Sue Powers-Hartman
Sent: Tuesday, March 12, 2013 8:50 AM
To: [log in to unmask]
Subject: [TN] Cleanliness

Per 610E, visual inspection may require the use of magnification when fine pitch or high density assemblies are present.  What tells me what constitutes a high density assembly.  Are there measurements listed somewhere that I can reference.

Thanks

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