Journal of Industrial Engineering and ManagementJIEM, 2015 – 8(1): 233-266 – Online ISSN: 2013-0953 – Print ISSN: 2013-8423 htt:!!"#$"%i$%r&!10$3926!'ie$119Developing an Agent-Based Model on How Different Individuals Solve Complex ProlemsIpek Bozkurt University of Houston Clear Lak e (United State s) [email protected]Received: une!"#$ %cce&ted: 'eceer !"#$ Astra!t"Purpose"Research that focuses on the emotional, mental, behavioral and cognitive capabilities of individuals has been abundant within disciplines such as psychology , sociology, and anthropology, among others. However, when facing complex problems, a new perspective to understand indi viduals is necessary. he main purpose of this paper is to develop an agent! based model and simulation to gain understanding on the decision!making and problem!solvingabilities of individuals . Design#met$odolog%#approa!$"he micro!lev el analysis modeling and simulation paradigm "gent!Based #odeling hrough the use of "gent!Based #odeling, insight is gained on howdifferent individuals with different profiles deal with complex problems. $sing previous literature from diff erent bodies of knowledge, established theo ries and certain assumptions as input parameters, a model is built and executed through a computer simulation. &indings"he results indicate that individuals with certain profiles have better capabilities to deal with complex problems. #oderate profiles could solve the entire complex problem, whereas profiles within extreme conditions could not. his indicates that having a strongpredisposition is not the ideal way when approaching complex problems, and there should always be a component from the other perspective. he probability that an individual may use these capabilities provided by the opposite predisposition provi des to be a useful option. -233-
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er e ti e$ M+n+&er , %r in t+n e, + e + &%%" e#+ le %r thi t e % r% ile$ he
+n+&er % ten nee" t% %r7 ith "e+"line there %re 7ee in& * ith ert+in &%+l %*l" e
+n + r% ri+te h%i e %r the $ .l %, the % ten + nee" t% +7e "e i i%n hen e iri +l
"+t+ i l+ 7in& there %re + r+ti%n+li t re"i % iti%n %*l" e een in +n+&er +n" le+"er ,
in e the %*l" %ll% ert+in re+ %nin& r% e e t% re+ h "e i i%n $
Empiricist-Substantive- oGoal (ES ) profile represents PPI!: hi i th r% ile re ent +n
in"i i"*+l h% h+ +n e iri i t ten"en r% +n e i te %l%&i +l t+n e, e+nin& th+t
reli+n e * %n % er + le + t l+ +n i %rt+nt r%le %r thi in"i i"*+l$ One nee" t% h+ e +
ert+in h%li ti + r%+ h in %r"er t% etter "e+l ith *n7n% n t+te $
Empiricist-Process- oGoal (EP ) profile represents PPI": In the i#th r% ile, the in"i i"*+l i
+n e iri i t h% ten" t% rel %n en e "+t+, % er +ti%n , e+ *re ent , et $ =r% +n%nt%l%&i +l er e ti e, the in"i i"*+l ee re+lit + + r% e , + + h%le$ S% e le el %
formali/ation +*ic* involves bein& precise about +*at t*e t*eor' means an ma in&
sure t*at it is complete an co*erent is a ver' valuable iscipline in its o+n ri&*t ( $ 5)
il ert +n" r%it> h +l % t+te th+t the initi+ti%n %int hen * in& i *l+ti%n + + eth%" i
th+t there i + re+l %rl" hen% en%n (the t+r&et) th+t the re e+r her i intere te" in
in e ti&+tin&$ he +in *r % e % the i *l+ti%n, there %re, i t% re+te + %"el % th+t
t+r&et, hi h %*l" e i ler t% t*"$ ;% e er, + i"e r% thi i li i +ti%n, the %"el +l %
nee" t% e " n+ i , in e in % i+l ien e the t+r&et i %n t+ntl h+n&in& % er ti e, +n"
re+ tin& t% it en ir%n ent$ ;+ in& "e i"e" %n h+t the %"el h%*l" % ri e, +
re re ent+ti%n % the %"el + + e i i +ti%n nee" t% e %r *l+te"$ hi e i i +ti%n +n e
+"e in ter % + +the +ti +l e?*+ti%n, + l%&i +l t+te ent, %r + % *ter r%&r+ $ In
% e in t+n e , e e i+ll hen thi e i i +ti%n i n%t line+r, +n+l ti +l re+ %nin& + e
"i i *lt, %r e en i % i le$ h+t i h , il ert +n" r%it> h %n l*"e, i *l+ti%n i % ten the
%nl + $
. + re *lt % the + t + %*nt % re e+r h th+t h+ een "%ne %n ./M, it +n e +i" th+t
there i %n en * t% % e "e&ree %n h+t h+r+ teri ti +n +&ent h%*l" % e $ +7in&
int% %n i"er+ti%n + + le % the e re e+r he (<+* +n, 1995 Jennin& , S +r+
%%lri"&e, 1998 il ert ern+, 2000 /%n+ e+*, 2002 M+ +l N%rth, 2005), here i h%
+n +&ent +n e "e ine":
1$ .&ent +re i"enti i+ le, el - %nt+ine", "i rete in"i i"*+l , % e in& their % n et %
h+r+ teri ti +n" r*le $ hi e+n th+t +n +&ent h+ it % n %*n"+rie , hi h hel
"eter ine hether % ethin& el%n& t% +n +&ent, %r i %*t i"e % the %*n"+rie %
th+t +&ent$
2$ .&ent +re it*+te" in +n en ir%n ent, hi h r% i"e the e"i* %r +&ent t%
inter+ t ith %ther +&ent $ here ert+in r*le %r the inter+ ti%n % +&ent $
3$ .&ent +re &%+l-"ire te", e+nin& th+t e+ h +&ent h+ + &%+l t% + hie e$
4$ .&ent +re +*t%n% %* the in"e en"entl ee7 their % n &%+l + e" %n their % nl% +l in %r +ti%n$ here i n% entr+l +*th%rit , %ntr%ller %r l+nner$ hi +7e el -
%r&+ni>+ti%n % i le$
5$ .&ent +re inter"e en"ent$ he + ti%n % e+ h +&ent in l*en e the %ther $
6$ .&ent %ll% e#tre el i le r*le , i le t +n" e t * %rte" + * ti%n + %*t
in"i i"*+l +&ent eh+ i%r$
$ .&ent +re le#i le, e+nin& th+t the h+ e the + ilit t% le+rn +n" +"+ t their
eh+ i%r % er ti e$ hi i re le te" +t the in t+n e here +n +&ent h+ + %r %
hi l+ t t+&e i here the +&ent- + e" %"el i *ilt, %n i tin& % t % h+ e $ Ph+ e 1
re ent +n e# l+n+ti%n %n h% the * er- %"el inter+ ti%n t+7e l+ e, +n" Ph+ e 2 i +
"et+ile" "i * i%n %n the + t*+l i *l+ti%n %"el, +n" h+t i t+7in& l+ e in i"e the
i *l+ti%n r*n$ here %re, the e t % le el % *r i *lt+ne%* l $ he * er i re %n i le r%
the initi+l et* %n"iti%n , +n" the r*nnin& % the r%&r+ $ hile the i *l+ti%n i ein& r*n
+ %r"in& t% the r*le +n" inter+ ti%n "e ri e" in Ph+ e 2, the * er +n "ire tl % er e the
%*t *t i"enti ie"$ . %re "et+ile" +n+l i % thi %*t *t t+7e l+ e + ter +r" $
$.3.1. Representation of the Individual
he three "i en i%n % the r% ile %r the in"i i"*+l ( r% n% %n Kin"i i"*+l +&ent ) +re
re re ente" + e +r+te +&ent $ he +in re i e % the PPI i th+t the er %n+lit r% ile i
% % e" % three hil% % hi +l "i en i%n , +n" the e "i en i%n h+ e t % +in % %nent
hi h re re ent the re"i % iti%n % the in"i i"*+l$ /*il"in& * %n th+t re i e, the e %n"
% %nent % thi re e+r h i t% ee h% the e re"i % iti%n , "i en i%n +n" r% ile "e+l
ith r% le % ert+in % le#it $ .ll +&ent % e % %n +ttri *te , n+ el h+ e,
i>e, l% +ti%n, n* er, +n" % e ent, ener& +n" ID$
•
#hape: E+ h % the hil% % hi +l "i en i%n (e i te %l%& , %nt%l%& +n" tele%l%& ) ire re ente" + "i erent h+ e$
• #i!e: he in"i i"*+l +&ent h+ e + i>e % 1$4$ hi +l*e i "i erent r% the i>e %r
the r% le +&ent n%t %nl e +* e % i *+l *r % e , *t +inl e +* e % ert+in
tr+ 7in& "% n +n" %*t *t l%ttin& *r % e $
• 'ocation: E+ h % the in"i i"*+l +&ent i r+n"% l l+ e" hen re+te"$
• (umber: he initi+l n* er % in"i i"*+l +&ent i "eter ine" the * er +n" +n e
et een >er% +n" i t , ith in re+ in& in re ent % 2 (i$e$ 0, 2, 4, et $)$ he re+ %n
%r thi i e# l+ine" in l+tter e ti%n $
• %ovement: hen + 7e" t% % e, +ll r% le +&ent % e %ne te %r +r", then
+7e + r+n"% 90 t*rn, +n" % e %ne te %r +r" +&+in$ he *r % e ehin" the
% e ent i t% re+te + e+n % inter+ ti%n %r the +&ent re re entin& + r% le
+n" +n in"i i"*+l$
•
#pecific variable: .ll in"i i"*+l +ri+ le h+ e ert+in Kener& $ =%r the in"i i"*+l+&ent , thi re re ent the capabilit' % the e i i re"i % iti%n t% %l e the e i i
=i&*re 6 re re ent the + % e te %r the re+ti%n % the r% le +&ent $ hen +
r% le +&ent i re+te", i il+r t% the in"i i"*+l +&ent , the i>e +n" l% +ti%n +re
re et$ he initi+l n* er % +&ent i "eter ine" thr%*&h the Kn* er % r% le
+&ent li"er$ he le el % % le#it % the r% le i "eter ine" + "i * e" + % e$
he %l%r +n" the "i i *lt +l*e %r the +&ent +re "eter ine" + %r"in& t% the initi+l
ettin& the * er h%% e $
=i&*re 6$ Set* %r Pr% le .&ent
-. Rules
. ter &%in& thr%*&h the &ener+l +ttri *te %r +ll +&ent , +n" e i i +ttri *te %r r% le
+n" in"i i"*+l +&ent , thi e ti%n r% i"e the el+ %r+ti%n %r the r*le th+t the +&ent %ll% $
here +re three et % r*le th+t the i *l+ti%n en ir%n ent +n %nt+in: (1) B*le
( h+r+ teri ti ) % in"i i"*+l +&ent , hi h +re %n i"ere" t% e K ri +te in %r +ti%n,r% i"e" t% e+ h in"i i"*+l +&ent * h th+t the +re re+" t% e in *t in the Net@%&%
en ir%n ent, %r +&ent t% %ll% (2) B*le th+t +re % %n t% +ll +&ent , hi h +re
le er "e&ree$ =%r in t+n e, the "i +" +nt+&e +n E iri i t h+ % er l+ 7 % + +il+ le
in %r +ti%n i n%t in the + e e#tent th+t + %+l-%riente" in"i i"*+l h+ ith +n
+ i&*%* r% le , hen e the "e re+ e in + + ilit ith +n in re ent % -1$ ;% e er,
the r% le "i i *lt till re +in *n h+n&e"$
• Problem Solve : hi r*le in"i +te th+t the re"i % iti%n "%e h+ e tr%n& + + ilitie
hen "e+lin& ith th+t +rti *l+r r% le +ri+ le, e$&$ +n E iri i t +&ent + in& +n
in %r +ti%n +ri+ le ith + hi&h le el % + +il+ le in %r +ti%n$ In thi + e, thi +&ent i
+ le t% %l e th+t +rti *l+r r% le +ri+ le, +n" in t*rn in re+ e it + + ilitie
T2$ he r% le "i i *lt "e re+ e -2$
• Problem Solve 6ess : hi r*le, i il+r t% the e %n" %ne, i + %"i ie" er i%n % the
re i%* r*le$ In thi + e, the re"i % iti%n i till + + le % "e+lin& ith + +rti *l+r
r% le +&ent, +l eit in + le er "e&ree$ here %re the + + ilit &+in i T1, +n" ther% le "i i *lt i "e re+ e" -1$
he e * tle "i eren e +re ne e +r in %r"er t% + t*re the n*+n e ithin re"i % iti%n ,
+n" the + the "e+l ith e+ h r% le +ri+ le$ ith%*t the e "i erent r*le , the e er&ent
+ + ilit % the +&ent- + e" %"el %*l" h+ e een i&n%re", +n" the h%le *r % e % * in&
thi e i i eth%" %*l" h+ e een "e e+te"$
he te % h% the % *ter i *l+ti%n i &%in& t% t+7e l+ e +re * +ri>e" in =i&*re 9$
=i&*re 9$ O er+ll B*le Ch+rt
. the ir t te , the * er ele t the n* er % +&ent "e ri in& the r% le +ri+ le , +n"the n* er % +&ent "e ri in& in"i i"*+l re"i % iti%n $ =%ll% in& thi , thr%*&h the
re"i % iti%n +le , the * er ele t the r% ile t% e e# l%re"$ he r% le %n"iti%n +n
e "eter ine" the * er + ell$ E+ h % the i e +ri+ le (+ +il+ le in %r +ti%n, n* er %
entitie , t+ ilit , + i&*it +n" ti e) +n e +"'* te" e +r+tel $ i e %r the i *l+ti%n r*n
+n +l % e +"'* te" + %r"in& t% the nee" % the * er$ he r*n +n h+ e n% ti e li it in thi
+ e the %"el i %"e" in * h + + th+t it %*l" ter in+te it el hen there +re n%
in"i i"*+l %r r% le +&ent $ hen the * er hit the K et* *tt%n, the re"eter ine"
n* er % +&ent ill e re+te" +n" r+n"% l "i tri *te" %n the inter + e, hi h i the
en ir%n ent in hi h the +&ent inter+ t ith e+ h %ther$ he in"i i"*+l +&ent +re + i&ne"
ert+in + + ilitie , +n" the r% le +&ent +re + i&ne" "i i *ltie $
hen the r%&r+ i t+rte" ith the K&% *tt%n, %th the in"i i"*+l +n" r% le +&ent ill
t+rt % in& r+n"% l $ hi e+n th+t there i n% + r% le th+t the in"i i"*+l nee" t%
+""re $ he in"i i"*+l +&ent l%%7 %r r% le +&ent t% %l e$ On e the in"i i"*+l +&ent
% e + r% + r% le +&ent, the in"i i"*+l +&ent "eter ine h+t t e (e$&$ Kin % ) +n"
h+t le el (e$&$ Khi&h ) th+t r% le +&ent i $ . %r"in& t% the h+r+ teri ti % the r% le+&ent +n" the in"i i"*+l +&ent it el , the in"i i"*+l ill either %l e the r% le %r n%t$ I the
in"i i"*+l +&ent +n %l e the r% le , the + + ilit % th+t +&ent ill in re+ e, +n" the
"i i *lt % the r% le +&ent ill "e re+ e$ I the in"i i"*+l +&ent +nn%t %l e the r% le ,
the + + ilit ill in re+ e, +n" the r% le "i i *lt ill re +in the + e$ hi r% e
%ntin*e *ntil there +re n% %re r% le %r in"i i"*+l +&ent re +inin&$
-.$. )valuation Criteria
In %r"er t% + *r+tel "eter ine +n" inter ret the re *lt , ert+in riteri+ nee" t% e
e t+ li he"$ he ir t i rel+te" t% the in"i i"*+l, +n" the e %n" i rel+te" t% the % le#
r% le $
Criteria for the Individual:
hi i rel+te" ith the e e ti ene % the PPI *n"er ?*e ti%n, +n" trie t% +n er the
?*e ti%n: ;% "% I 7n% i the r% ile i e e ti e
• Success: he etter +n in"i i"*+l +&ent i ith + r% le +&ent (+ %r"in& t% the r*le
+ % e), the %re + + ilitie it ill &+in hen %l in& the r% le $ here %re, hen +n
in"i i"*+l +&ent +tte t t% %l e + r% le +&ent th+t it i % %rt+ le %l in&, the
+ + ilit % the in"i i"*+l +&ent ill in re+ e$ I n%t, the + + ilit % the in"i i"*+l
+&ent ill "e re+ e$
• onsistenc': hi ill "e en" %n h% * e *l +n in"i i"*+l +&ent i % er ti e, in
"i erent r*n $ It i r* i+l t% l%%7 +t hether %r n%t the + + ilit % the +rti *l+r
hen "e+lin& ith + % le# r% le , the re *lt h% th+t the e +rti *l+r re"i % iti%n
r% i"e * e *l + + ilitie t% the in"i i"*+l$ On the %ther h+n", the r% ile th+t nee"e" the
l%n&e t ti e ere PPI1 (ES ) +n" PPI4 (BP )$ he &%+l-%rient+ti%n % the r% ile %r7 + +
"i +" +nt+&e in the + e % the e t % r% ile $
=i&*re 11$ C% +ri %n % Pr% ile %r C% le# Pr% le S%l*ti%n
S% e intere tin& %n l* i%n +n e "r+ n r% thi $ It %*l" e % er e" th+t the r% ile
ere l* tere" int% 2 &r%* the ir t &r%* %n i tin& % PPI8, PPI , PPI6 +n" PPI3 +n" the
e %n" &r%* ein& PPI2, PPI5, PPI4 +n" PPI1$ ith the e# e ti%n % PPI3 +n" PPI5, the t %
&r%* +re "i i"e" + %r"in& t% their tele%l%&i +l "i en i%n, ith the r% ile h+ in& n% &%+l
%rient+ti%n %n the le t h+n" i"e, in"i +tin& ?*i 7er r% le %l*ti%n, +n" the &%+l %riente"
r% ile t+7in& + l%n&er ti e t% %l e + r% le $ E en th%*&h PPI5 (ESN) h+re the + e%nt%l%&i +l +n" tele%l%&i +l re"i % iti%n ith r% ile PPI (BSN), the e i te %l%&i +l
In %r"er t% %n"* t + "ee er +n+l i % thi , the %ll% in& .NOF. t+ le h+ een % t+ine" %r
the ei&ht r% ile ( + le 2)$
A(, A
Problem solved
#um of s uares df %ean s uare & #i".
/et een &r%* 965335$396 13 905$05 180$15 $000
ithin &r%* 2$64ET0 34440 65$4 3
%t+l 2$ 3ET0 3444
+ le 2$ .NOF. %r +ll r% ile %l in& r% le
. een r% + % e t+ le, the ei&ht &r%* +re "i erent r% e+ h %ther ( 0$05)$ ;% e er,
in %r"er t% +""re the "i eren e et een the r% ile %re + *r+tel in ter % time ,
*rther +n+l i h+ e een %n"* te" %r the r% ile %n i"erin& the i il+ritie + %r"in& t%
the re i%* +r h+rt$
he tr+"iti%n+l % t h% +n+l i eth%" * h + *7e %*l" n%t e * e" in thi + e,
e +* e the + le "i" n%t + the h% %&eneit % +ri+n e te t$ . + re *lt % thi ,
+ e -;% ell % t h% +n+l i + %n"* te"$ he re *lt % t+ine" h% e" th+t, i il+r t%
the +r h+rt + % e, PPI2, PPI4 +n" PPI5 ere n%t i&ni i +ntl "i erent r% e+ h %ther +n"
there %re %r e" %ne l* ter$ he + e re *lt ere een %r PPI6, PPI +n" PPI8, hi h ere+l % n%t i&ni i +ntl "i erent r% e+ h %ther$ ;% e er, PPI1 +n" PPI3 ere i&ni i +ntl
"i erent r% +ll % the %ther r% ile , +n" r% e+ h %ther$ he e re *lt re re ent the
i il+ritie +n" "i eren e et een the ei&ht r% ile in ter % the ti e it t%%7 the t% %l e
the % le# r% le $ he %ll% in& %n l* i%n +n e "r+ n r% the e re *lt : hen the
e i te %l%&i +l re"i % iti%n i r+ti%n+li t, +n" there i n% &%+l %rient+ti%n, then the
%nt%l%&i +l re"i % iti%n "%e n%t h+ e + i&ni i +nt e e t %n the % er+ll eh+ i%r % the
r% ile, hen e the l+ 7 % "i eren e et een PPI +n" PPI8$ hi + e "*e t% the + t th+t
in e the r+ti%n+li t re"i % iti%n ill * e 7ill * h + re+ %nin&, "e"* ti%n +n" l%&i t% &+inin %r +ti%n +n" + ?*ire 7n% le"&e + %*t + % le# r% le , h% th+t r% le i "e ine"
( hether + in"i i"*+l entitie , %r + + e?*en e) "%e n%t e % e rele +nt$ I the
e i te %l%&i +l re"i % iti%n + e iri i t, thi %*l" h+ e een "i erent, + in the + e %
PPI5 (ESN) +n" PPI6 (EPN)$ he e t % r% ile +re "i erent r% e+ h %ther, e+nin& th+t the
%nt%l%&i +l re"i % iti%n in thi + e h+ + i&ni i +nt e e t, in e the e iri i t in"i i"*+l ill
nee" t% %lle t h+r" "+t+ +n" + t t% *n"er t+n" + r% le $ he "e initi%n % th+t r% le
e % e rele +nt in thi t e % it*+ti%n$
It +n e een th+t PPI3 +n" PPI2 +re i&ni i +ntl "i erent r% e+ h %ther + ell$ E en
th%*&h the +re "i erent in ter % %th their e i te %l%&i +l +n" %nt%l%&i +l re"i % iti%n ,
%ne % the +in re i e + th+t the e iri i t re"i % iti%n + h% n t% h+ e * h le
;% e er, in %r"er t% l%%7 +t *rther "et+ile" inter ret+ti%n , + % t h% +n+l i + +l %
%n"* te"$ he + + ilit +ri+ le +l % "i" n%t + the h% %&eneit % +ri+n e te t,
there %re i il+r t% the re i%* e ti%n, + e -;% ell % t h% +n+l i + %n"* te"$ he
re *lt h% th+t %nl PPI +n" PPI8 +re n%t i&ni i +ntl "i erent r% e+ h %ther$ he
%ll% in& %n l* i%n +n e "r+ n r% thi : Si il+r t% the r% le %l e", the %nt%l%&i +l
"i en i%n "i" n%t h+ e +n e e t %n the + + ilit &+ine" the r% ile PPI +n" PPI8$ In
ter % + + ilitie &+ine" %r l% t, *nli7e the r% le %l e", the r% ile eh+ e" "i erent
r% e+ h %ther ( ith the e# e ti%n % PPI +n" PPI8)$ hi e+n th+t +ll three hil% % hi +l
"i en i%n h+" % ethin& "i erent t% %ntri *te t% the eh+ i%r % the % er+ll r% ile$
.2. Canons of Research
ener+li>+ ilit , + li + ilit , %n i ten , re r%"* i ilit , re i i%n, eri i +ti%n +n" +li"+ti%n
+re e#+ le % +n%n th+t + re e+r h, thr%*&h it re e+r h "e i&n, * t r% i"e * i ient
"e th$ .n re e+r h th+t "e+l ith % i+l i *e , th+t h+ + *r % e % &+inin& in i&ht %n
% le# r% le , +n" th+t h+ little %r n% e iri +l %*n"+ti%n %r % %rt*nit % % er +ti%n
% hen% en+ *n"er ?*e ti%n nee" t% e t+ li h the + r% ri+te +n%n t% e * e", +n" %ll%
the $
E,ternal vali it' i rel+te" t% the &ener+li>+ ilit % the t*" , e$&$ r% + + le t% +
% *l+ti%n, hi h i + e" %n e t+ li hin& the "% +in % + t*" $ <eli'nen (1999: +&e 648)n%te th+t KLi n% "+t+ %n the re+l te +re + +il+ le, then tr%n& +li"+ti%n l+i +re
i % i le $ =r% the r+ti%n+li t er e ti e, e#tern+l +li"it i % * e" %n the + li + ilit t%
the %nte#t r% hi h the re i e ere "eri e"$ In %ther %r" , the re *lt h%*l" +7e
en e hen ein& %n i"ere" r% +ri%* %"ie % 7n% le"&e th+t r% i"e the + i %r the
+ 7&r%*n" re e+r h$ In the + e %r thi re e+r h, %r in t+n e, "% the in i&ht th+t h+ e een
&+ine" +7e en e D%e the + +n in"i i"*+l ith + ert+in PPI %l e % le# r% le
+7e en e =%r i *l+ti%n in the % i+l ien e , <* er +n" @enh+r" (2005) +r&*e th+t
+li"it (in the l+ i +l, tr+"iti%n+l en e) i n%t +n +"e?*+te e+ *re$ . /% el (1994)
t+te , the %n tr* ti%n % + %"el ill +l + in l*"e i li i +ti%n , +&&re&+ti%n , % i i%n
+n" + tr+ ti%n $ S+r&ent (1999) t+te" th+t "e el% in& + %"el h%*l" e + e" %n + e i i
*r % e, +n" the +li"it % th+t %"el nee" t% e %n i"ere" ith re e t t% th+t *r % e$
/% el (1994) h+" +r&*e" the + e %int hen he t+te" th+t + i *l+ti%n %"el +nn%t e
"i * e" in ter % it correctness *t %nl in ter % it +li"it ith re e t t% the %"el
*r % e$
onstruct vali it' i "e ine" + Kthe "e&ree t% hi h in eren e +n le&iti +tel e +"e r%
the % er+ti%n+li>+ti%n in Lthe t*" t% the the%reti +l %n tr* t %n hi h th% e% er+ti%n+li>+ti%n ere + e" ( r% hi , 2006)$ In %ther %r" , e t+ li hin& %n tr* t
+li"it +7e *re th+t %rre t % er+ti%n+l e+ *re +re * e" %r the %n e t th+t +re ein&
t*"ie" (Hin, 2003)$ hen %n i"ere" ith re e t t% the r+ti%n+li t "e"* ti e eth%"%l%& ,
thi t e % +li"it i + li + le "*rin& the tr* t*r+ti%n "e el% ent t+&e$ C%n tr* t
+li"it i rele +nt t% the re i e ein& +"e e# li it$ Si il+r t% intern+l +li"it , %n tr* t
+li"it i + e" %n the %herent tr* t*re % the re i e +n" the + the +re %r *l+te" in
%r"er t% "e ri e +n" *il" 7n% le"&e l+i $ he + the re i e +n e tr+ e" + 7 t%
liter+t*re +n" + t the%rie i +n in"i +t%r %r thi t e % +li"it $
/+l i (199 : +&e 1) "e ine verification % + %"el + K * t+nti+tin& th+t the %"el i
tr+n %r e" r% %ne %r int% +n%ther, + inten"e", ith * i ient + *r+ $ In %ther ter ,
it +7e *re th+t the %"el i *ilt ri&ht$ . %r"in& t% S+r&ent "e initi%n (S+r&ent, 1999),
eri i +ti%n % + %"el en *re th+t the % *ter r%&r+ % the %"el +n" the
i le ent+ti%n +re r*nnin& %rre tl $ . %r"in& t% S+r&ent (1999), i + i *l+ti%n l+n&*+&e
i * e" ithin the % *ter r%&r+ in&, %"el eri i +ti%n +7e *re th+t the i *l+ti%n
l+n&*+&e i err%r ree, h+ een r% erl i le ente", +n" h+ een %rre tl r%&r+ e"$S% e re e+r her , the eri i +ti%n h+ e i i"enti +l t% the intern+l +li"it h+ e +n" in l*"e
"e *&&in&, hi h i "%ne t% en *re th+t the % *ter r%&r+ i r*nnin& + inten"e"$ here
+re ert+in te th+t nee" t% e t+7en in %r"er t% eri the i *l+ti%n %"el$ he %ll% in&
te +re "e ri e" il ert (2008), + ell + M+ +l +n" N%rth (200 ):
• o e ele&antl' : hi +" i e tie + 7 t% the %re % %"elin& +n" i *l+ti%n, here the
%"in& nee" t% e + i le + % i le, *t n%t t%% i le th+t ne e +r "et+il
%*l" e % itte"$ It + the intenti%n % the +*th%r t% * e + i le +n" e line +
% i le, hile +7in& *re th+t +ll the "et+il % the %"el ere in %r %r+te" ithin
the i le ent+ti%n$
• Inclu e output an ia&nostics : Net@%&% r% i"e + r+n&e % *tt%n , li"er +n"
%nit%r t% tr+ e e+ h te % the i *l+ti%n, +n" t% en *re th+t e+ h %*t *t +n"
%*t % e r% the i *l+ti%n i % eh% + t*re" thr%*&h the +n t%%l + +il+ le t%
the %"eler$
•
7bserve simulation step b' step : hi te i tie" t%ðer ith the re i%* %ne$Settin& * the %rre t tr+ 7er +n" %nit%r &i e the * er the +" +nt+&e t% % er e
h+t e#+ tl i &%in& %n +t +n %int % the i *l+ti%n$ Sl% in& "% n the i *l+ti%n
r% e +l % i + * e *l + r%+ h th+t + +"+ te" the +*th%r$ he % e ent %
e+ h +&ent +n" their inter+ ti%n thr%*&h + i *l+ti%n r*n %ne ti e te +t + ti e +
% er e"$ hi + , +n +n% +lie th+t % *r "*rin& the i *l+ti%n %*l" e +*&ht +
%%n + the % *r$
• % comments an up ate t*em : he C% +n" Center e+t*re th+t i + +il+ le in
Net@%&% +n e, +n" + , * e" t% tr+ 7 "% n e er % e ent th+t % *rre" in the
i *l+ti%n$ =%r in t+n e, hen +n +&ent re re entin& +n in"i i"*+l +nn%t %l e +
+rti *l+r r% le , the C% +n" Center re+" K %*l"n t %l e % le# r% le , +n"
+ %r"in& t% the r*le + i&ne" t% th+t +rti *l+r +&ent, the + + ilit % the +&ent
h%*l" "e re+ e$ .n%ther e#+ le %*l" e K %*l" %l e e"i* r% le , here the
+ + ilit i e# e te" t% in re+ e$ / re+"in& thi , +n" +l % l%%7in& +t the +&ent , the
re e+r her %*l" ee i h+t + h+ enin& + + t*+ll + +t h ith h+t + %"e"$
• 8se unit testin& : In thi re e+r h, thi i "%ne e +r+tin& the Net@%&% r%&r+ int%
* - e ti%n % %"e, tr+n errin& th% e +rti *l+r line % %"e int% + e +r+te ile +n"
+7in& *re th+t e+ h +t h % %"e r*n ith%*t +n err%r$
4. Conclusion
hi re e+r h "%e n%t +tte t t% "e el% + *ll % rehen i e +n" "et+ile" %"el % h%in"i i"*+l thin7, eh+ e +n" + t$ S* h % le#it i +l % t i % i le t% *n"er t+n" in re+l
li e, let +l%ne in + i *l+te" %"el$ ;% e er, h+t thi re e+r h r% i"e i + e+n t% &+in
in i&ht %n + +ll %rti%n % in"i i"*+l er %n+litie , %n h% in"i i"*+l ith "i erent
hil% % hi +l r% ile "e+l ith % le# r% le $ It h+ een e t+ li he" +n "i erent
t*"ie ( %th + +"e +n" in"* tr -%riente") th+t the + li +ti%n % er %n+lit r% ile
in re+ e the r%"* ti it % the ir , + ell + the r%"* ti it +n" +ti + ti%n % the
in"i i"*+l$ Sel -+ +rene i +n e#tre el * e *l +n" ne e +r %n e t t% h+ e ithin +n
in"i i"*+l li e$ I e +re + +re % %*r re"i % iti%n , %*r %rl" ie , %*r inner %rl", e ill*n ti%n etter in the %*ter %rl"$ E t+ li hin& hil% % hi +l r% ile % in"i i"*+l ill +l %
r% e t% e * e *l hen it % e t% inter+ ti%n ith %ther e% le, *il"in& te+ et $ It i
le+r th+t in"i i"*+l ith ert+in re"i % iti%n ill %r7 etter ith in"i i"*+l h% % e
the + e %rl" ie $ .&ent-/+ e" %"elin& h+ een h% en + +n + r% ri+te t%%l %r thi
re e+r h, in e it % e e ert+in h+r+ teri ti th+t +re nee"e" in the%r e# l%r+ti%n, +
ell + &+inin& in i&ht %n % le# it*+ti%n $
he %n e t*+l, eth%"%l%&i +l +n" r+ ti +l i li +ti%n % the re e+r h r% i"e +ri%*
% %rt*nitie %r *t*re re e+r h t% i $ One * h *t*re re e+r h +re+ i tr+n errin& the
re e+r h t% +n e iri i t +r+"i& +n" e iri +ll +n+l >in& the r% ile th+t h+ e een
"e el% e", r% % e" +n" e# l%re"$ he r% ile here re ente" +re "%ne % in + r+ti%n+li t
+nner, thr%*&h the * e % + % *ter i *l+ti%n, +n" +n + e ent %n h% t% e iri +ll
te t the PPI i +rt % + %r7 in r%&re $ he initi+l te t+7en %r thi i the % er+ti%n+li>+ti%n
% the r% ile $ hi i "%ne "e el% in& + ?*e ti%nn+ire (PPI-G) in %r"er t% te t +n" +li"+te
the "i en i%n , + ell + the r% ile the el e $ St+te ent * h + KIn %r"er t% + e t
% ethin& t% e tr*e, I %*l" nee" t% h+ e + t*+l r%% +n" KI li7e t% e %r&+ni>e" +n" l+n
+he+" +re * e" t% "eter ine the in"i i"*+l re"i % iti%n +n" rele +nt r% ile $ hr%*&h
+ r% ri+te "e %&r+ hi t*"ie , r% ile % "i erent &r%* * h + + +"e i $
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