<s>
Architecturally	B-Architecture
significant	I-Architecture
requirements	I-Architecture
are	O
those	O
requirements	O
that	O
have	O
a	O
measurable	O
effect	O
on	O
a	O
computer	O
system	O
’s	O
architecture	B-Architecture
.	O
</s>
<s>
They	O
are	O
a	O
subset	O
of	O
requirements	O
,	O
the	O
subset	O
that	O
affects	O
the	O
architecture	B-Architecture
of	O
a	O
system	O
in	O
measurably	O
identifiable	O
ways	O
.	O
</s>
<s>
Architecturally	B-Architecture
significant	I-Architecture
requirements	I-Architecture
were	O
only	O
recently	O
,	O
as	O
of	O
2016	O
,	O
recognized	O
as	O
an	O
important	O
notion	O
.	O
</s>
<s>
When	O
talking	O
about	O
architecture	B-Architecture
,	O
the	O
terms	O
non-functional	O
requirements	O
or	O
quality	O
attributes	O
are	O
often	O
used	O
.	O
</s>
<s>
However	O
recent	O
empirical	O
studies	O
show	O
that	O
,	O
for	O
a	O
software	O
system	O
,	O
not	O
all	O
non-functional	O
requirements	O
affect	O
its	O
architecture	B-Architecture
,	O
and	O
functional	O
requirements	O
can	O
also	O
affect	O
its	O
architecture	B-Architecture
.	O
</s>
<s>
This	O
research	O
suggests	O
that	O
,	O
when	O
discussing	O
software	B-Architecture
architecture	I-Architecture
,	O
it	O
is	O
worth	O
distinguishing	O
which	O
software	O
requirements	O
are	O
architecturally	O
significant	O
,	O
as	O
well	O
as	O
whether	O
they	O
are	O
functional	O
.	O
</s>
<s>
Architecturally	B-Architecture
significant	I-Architecture
requirements	I-Architecture
can	O
be	O
characterized	O
from	O
the	O
following	O
aspects	O
.	O
</s>
<s>
Architecturally	B-Architecture
significant	I-Architecture
requirements	I-Architecture
are	O
often	O
hard	O
to	O
define	O
and	O
articulate	O
,	O
tend	O
to	O
be	O
expressed	O
vaguely	O
,	O
tend	O
to	O
be	O
initially	O
neglected	O
,	O
tend	O
to	O
be	O
hidden	O
within	O
other	O
requirements	O
,	O
and	O
are	O
subjective	O
,	O
variable	O
,	O
and	O
situational	O
.	O
</s>
<s>
none	O
of	O
the	O
responsibilities	O
of	O
already	O
existing	O
components	O
in	O
the	O
architecture	B-Architecture
addresses	O
it	O
.	O
</s>
<s>
The	O
requirement	O
has	O
QoS/SLA	O
characteristics	O
that	O
deviate	O
from	O
all	O
ones	O
that	O
are	O
already	O
satisfied	O
by	O
the	O
evolving	O
architecture	B-Architecture
.	O
</s>
<s>
Seven	O
criteria	O
for	O
architectural	O
significance	O
were	O
discussed	O
at	O
the	O
European	O
Conference	O
on	O
Software	B-Architecture
Architecture	I-Architecture
in	O
2020	O
:	O
business	O
value/risk	O
,	O
stakeholder	O
concern	O
,	O
quality	O
level	O
,	O
external	O
dependencies	O
,	O
cross-cutting	O
,	O
first-of-a-kind	O
,	O
source	O
of	O
problems	O
on	O
past	O
projects	O
.	O
</s>
<s>
See	O
discussion	O
of	O
design	O
vs.	O
architecture	B-Architecture
under	O
software	B-Architecture
architecture	I-Architecture
for	O
additional	O
criteria	O
of	O
architectural	O
significance	O
.	O
</s>
<s>
Like	O
all	O
non-functional	O
requirements	O
and	O
quality	O
attribute	O
requirements	O
,	O
architecturally	B-Architecture
significant	I-Architecture
requirements	I-Architecture
should	O
be	O
specified	O
in	O
a	O
SMART	O
way	O
.	O
</s>
<s>
It	O
has	O
been	O
suggested	O
to	O
keep	O
architecture	B-Architecture
analysis	O
and	O
design	O
lightweight	O
and	O
flexible	O
;	O
quality	O
attribute	O
trees	O
for	O
certain	O
application	O
genres	O
and	O
technology	O
domains	O
can	O
support	O
such	O
approaches	O
.	O
</s>
<s>
It	O
is	O
important	O
to	O
communicate	O
the	O
elicited	O
architecturally	B-Architecture
significant	I-Architecture
requirements	I-Architecture
,	O
and	O
any	O
other	O
architectural	O
artifacts	O
,	O
in	O
a	O
notation	O
and	O
language	O
that	O
is	O
comprehensible	O
for	O
the	O
target	O
audience	O
(	O
in	O
particular	O
,	O
business	O
stakeholders	O
)	O
.	O
</s>
<s>
Architecturally	B-Architecture
significant	I-Architecture
requirements	I-Architecture
are	O
used	O
in	O
software	O
design	O
to	O
drive	O
and	O
justify	O
architectural	B-Architecture
decisions	I-Architecture
;	O
if	O
not	O
satisfied	O
properly	O
,	O
they	O
contribute	O
to	O
the	O
accumulation	O
of	O
technical	O
debt	O
.	O
</s>
<s>
Exemplary	O
advice	O
on	O
how	O
to	O
address	O
system	O
quality	O
attributes	O
(	O
including	O
architecturally	B-Architecture
significant	I-Architecture
requirements	I-Architecture
)	O
is	O
available	O
in	O
the	O
literature	O
.	O
</s>
