29
2.2. 3. Po st-Implementati on Evaluati on
A
post -implement at ion evaluat ion
assesses
t
he overall
quality of
t
he
informat ion
system.
T
he
evaluat ion
verifies t hat
the
new
syst em meet s
specified
r
equirement s, comp lies
w t h user
it h user
object ives, and
p
roduces
t
he
ant icip ated
benefit s.
In
addit ion,
by
providing
feedback t o
t
he
development team, t he
evaluat ion also
help s improve
IT develop ment p ract ices
for fut ure p rojects. A p ost -
imp lement ation
evalu at ion
should
examin e
al l
asp ect s of the
develop ment
effort
and t he end
product —t he developed
informat ion sy stem (Shel ly , 2010).
2.3.
Transaction P roce ssing
Alternative s
St air(2010)stat ed about
basic
t
ransaction
p
rocessing alternat ives,
t
hat
when
an organiz at ion
needs
t
o
use
t
wo or
more comp ut er
sy stems,
it
can
implement
one of t hree b asic processing
alt ernatives:
cent raliz ed,
decent raliz ed, or dist ribut ed.
?
Cent ralized
Processing
Wit h
cent raliz ed
p
rocessing, all
processing oc curs in
a
single
locat ion
or
faci lit y . T his
app roach
offers
the
highest
de gree of
cont rol
because
a sin gle centrally
managed comput er
performs all
dat a
processing.
?
Decent raliz ed P ro©essing
Wit h decent ral ized
processing,
p
rocessing
devi ces are p laced at
various remot e
loc at ions.
Each
p
rocessin g devi ce is
isol at ed and does
not communicate wit h any ot her p rocessing
device.
D
ecent ralized
 |