As a former pwb fab guy, we used to treat a lot as each individual ‘work order’ on the floor. We would not group all individual fab work orders of the same p/n and treat them as a single lot because there is typically mix of processing dates (lamination dates, drill dates, plating dates, and so on). 

I think the generally accepted definition is something along the lines of: "lot is a group of parts processed together and presented for inspection at the same time".

6012 for example, defines sampling plans in Table 4-3, the table specifies also whether the sampling is lot based (once per lot), panel based or individual pwb based.
  
José (Joey) Ríos, Sr QA Engineer
Mission Assurance
Kavli Institute for Astrophysics & Space Research
Massachusetts Institute of Technology
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> On Dec 14, 2016, at 3:39 AM, Bush, Brien <[log in to unmask]> wrote:
> 
> You can refer to sampling standards at  ANSI/ASG Z1.4
> 
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> -----Original Message-----
> From: TechNet [mailto:[log in to unmask]] On Behalf Of Lehmicke, Michael
> Sent: Tuesday, December 13, 2016 11:03 PM
> To: [log in to unmask]
> Subject: [TN] Definition of the word lot in IPC-6013 - Bayesian Filter detected spam
> 
> When IPC-6013 talks about acceptance testing, it references a sampling plan per # of parts in a "lot".
> 
> I am curious what the definition of a "lot" is. Can anyone help?
> 
> Mike
> 
> Mike Lehmicke
> Project Engineer
> DSS Division
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