[e2e] Layering vs. modularization

[Joe Touch]

Hi, David,

David P. Reed wrote:
> 
> 
> Joe Touch wrote:
>>
>>> The layering concept is a particularly narrow form of structuring.   
>>> It implies that there is a single correct linear sequence for 
>>> building up a complete functional system.
>>
>> It presumes only that there is a total ordering. Such ordering can 
>> include branches and variations - only that any particular path has a 
>> unique order.
>>
> Huh? I think you are describing a lattice or poset, which is called a 
> Partial ordering, not Total.  Interesting, but not a "layering".

Lattice is probably closest. Partial order implies a few things I'm not 
sure I want.

> Youre describing a modular structure, not a layered architecture,

The order defines the layers; the fact that there is an order isn't 
sufficient to define either layering or modularity.

Joe

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