<s>
The	O
Twelve-Factor	B-General_Concept
App	I-General_Concept
methodology	I-General_Concept
is	O
a	O
methodology	O
for	O
building	O
software-as-a-service	B-Architecture
applications	O
.	O
</s>
<s>
The	O
methodology	O
was	O
drafted	O
by	O
developers	O
at	O
Heroku	B-General_Concept
,	O
a	O
platform-as-a-service	B-Application
company	O
,	O
and	O
was	O
first	O
presented	O
by	O
Adam	O
Wiggins	O
circa	O
2011	O
.	O
</s>
<s>
A	O
Nginx	B-Operating_System
architect	O
argued	O
that	O
the	O
relevance	O
of	O
the	O
Twelve-Factor	B-General_Concept
app	I-General_Concept
concept	O
is	O
somewhat	O
specific	O
to	O
Heroku	B-General_Concept
,	O
while	O
introducing	O
their	O
own	O
(	O
Nginx	B-Operating_System
's	O
)	O
proposed	O
architecture	O
for	O
microservices	O
.	O
</s>
