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+#1(:*2' 0#$%#&'&(+ (6*( 0*& 8' 2'4+', 8< (6' +#1(:*2' '&75&''29 >6'+'

components are then transported across a “boundary” that separates domain'&75&''25&7 12#$ 0#$%#&'&(38*+', ,'.'/#%$'&(9 `5742' L 5//4+(2*('+ * (<%50*/

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,5++'$5&*(5#&9 -#$*5& 0#&+(240(5#& *&, ,5++'$5&*(5#& *2' 0#&+5,'2', 5& /*('2

sections in this chapter. It can be argued that “reuse will disappear, not by

elimination, but by integration” into the fabric of softw*2' '&75&''25&7 %2*0(50' 9 C+

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\9 

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C/(6#476 (6' +('%+ =4+( &#(', %2#.5,' * 4+'14/ $#,'/ 1#2 ,#$*5& *&*/<+5+? (6'<

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•Is component functionality required on future imp/'$'&(*(5#&+[

• How common is the component's function within the domain? 

• Is there duplication of the component's function within the domain? 

• Is the component hardware dependent?  • Does the hardware remain unchanged between implementations? 

• Can the 6*2,:*2' +%'05150+ 8' 2'$#.', (# *&#(6'2 0#$%#&'&([

• Is the design optimized enough for the next implementation? 

• Can we parameterize a nonreusable component so that it becomes reusable? 

• Is the component reusable in many 5$%/'$'&(*(5#&+ :5(6 #&/< $5&#2 06*&7'+[

• Is reuse through modification feasible? 

• Can a nonreusable component be decomposed to yield reusable components? 

• How valid is component decomposition for reuse? 

O#. 3K8'8+&6',P8&,(% (2 Q*%+&,(%0-

A( 5+ +#$'(5$'+ ,511504/( (# ,'('2$5&' :6'(6'2 * %#('&(5*//< 2'4+*8/' 0#$%#&'&( 5+ 5&

1*0( *%%/50*8/' 5& * %*2(504/*2 +5(4*(5#&9 ># $*B' (65+ ,'('2$5&*(5#&? 5( 5+ &'0'++*2< (#

,'15&' * +'( #1 ,#$*5& 06*2*0('25+(50+ (6*( *2' +6*2', 8< *// +#1(:*2' :5(65& *

,#$*5&9 C ,#$*5& 06*2*0('25+(50 ,'15&'+ +#$' 7'&'250 *((2584(' #1 *// %2#,40(+ (6*(

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C +'( #1 ,#$*5& 06*2*0('25+(50+ 1#2 * 2'4+*8/' 0#$%#&'&( 0*& 8' 2'%2'+'&(', 8< e-%f

:6'2' '*06 5('$ 5& (6' +'( 6*+ +#$' +%'05150 ,#$*5& 06*2*0('25+(50+ &*$'/< -%5

X6'& &': +#1(:*2'? / ? 5+ (# 8' 845/( :5(65& (6' *%%/50*(5#& ,#$*5&? * +'( #1 ,#$*5&

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,'('2$5&' :6'(6'2 (6' ';5+(5&7 0#$%#&'&( $ 0*& 8' '11'0(5.'/< 2'4+', 5& *%%/50*(5#&

/@ 

E.'& :6'& +#1(:*2' (# 8' '&75&''2', 0/'*2/< ';5+(+ :5(65& *& *%%/50*(5#& ,#$*5&?

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applicability. In some cases (ideally, a limited number), “reinventing the wheel” may

+(5// 8' (6' $#+( 0#+(3'11'0(5.' 06#50'9

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O#< =&'*+&*'6 R()6;;,%@ 8%) =&'*+&*'6 N(,%&0-

8'074'70*; #",&;2%1 5+ * %*(('2&38*+', ,#$*5& '&75&''25&7 *%%2#*06 (6*( :#2B+

4&,'2 (6' *++4$%(5#& (6*( '.'2< *%%/50*(5#& ,#$*5& 6*+ 2'%'*(5&7 %*(('2&+ S#1

14&0(5#&? ,*(*? *&, 8'6*.5#42T (6*( 6*.' 2'4+' %#('&(5*/9 C00#2,5&7 (# P#//*2 *&,

Y5++$*& +(240(42*/ $#,'/+ 0#&+5+( #1 * +$*// &4$8'2 #1 +(240(42*/ '/'$'&(+$*&51'+(5&7 0/'*2 %*(('2&+ #1 5&('2*0(5#&9 >6' *2065('0(42'+ #1 +<+('$+ 4+5&7

+(240(42*/ $#,'/+ *2' 06*2*0('25F', 8< $4/(5%/' '&+'$8/'+ (6*( *2' 0#$%#+', 12#$

(6'+' $#,'/ '/'$'&(+9 G*&< *2065('0(42*/ 4&5(+ '$'27' 12#$ +5$%/' %*(('2&+ #1

interaction among this small number of elements”. D(240(42' P#5&( 5+ * ,5+(5&0(

0#&+(240( :5(65& * +(240(42' $#,'/9

G0G*6#& ^G"GMc_ ,'+0258'+ * +'074'70& $"2%' as “a distinct construct within a

structural model.” Structure points have three d 5+(5&0( 06*2*0('25+(50+Z

"# C +(240(42' %#5&( 5+ *& *8+(2*0(5#& (6*( +6#4/, 6*.' * /5$5(', &4$8'2 #1 5&+(*&0'+9Y'+(*(5&7 (65+ 5& #8='0(3#25'&(', =*27#& S"6*%('2 WUT? (6' +5F' #1 (6' 0/*++ 65'2*206<

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(6' ,#$*5&9 J(6'2:5+'? (6' 0#+( (# .'251<? ,#04$'&(? *&, ,5++'$5&*(' (6' +(240(42'

%#5&( 0*&&#( 8' =4+(515',9

.# >6' 24/'+ (6*( 7#.'2& (6' 4+' #1 (6' +(240(42' %#5&( +6#4/, 8' '*+5/< 4&,'2+(##,9

A& *,,5(5#&? (6' 5&('21*0' (# (6' +(240(42' %#5&( +6#4/, 8' 2'/*(5.'/< +5$%/'9

<# >6' +(240(42' %#5&( +6#4/, 5$%/'$'&( 5&1#2$*(5#& 65,5&7 8< 5+#/*(5&7 *//

0#$%/';5(< 0#&(*5&', :5(65& (6' +(240(42' %#5&( 5(+'/19 >65+ 2',40'+ (6' %'20'5.',

0#$%/';5(< #1 (6' #.'2*// +<+('$93K8'8+&6',P8&,(% (2 =&'*+&*'6 5(,%&0- 

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a9  D(240(42' %#5&( +6#4/, 5$%/'$'&( 5&1#2$*(5#& 65,5&7 8< 5+#/*(5&7 *//

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'&75&''2',9 >6*( 5+? &': +#1(:*2' 0#$%#&'&(+ $4+( 8' ,'.'/#%', *&, 5&('72*(',

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""# J%8;10,0 8%) 960,@% 2(' T6*06-

-*(*? 14&0(5#&*/? *&, 8'6*.5#2*/ $#,'/+ S2'%2'+'&(', 5& * .*25'(< #1 ,511'2'&(

&#(*(5#&+T 0*& 8' 02'*(', (# ,'+0258' :6*( * %*2(504/*2 *%%/50*(5#& $4+( *00#$%/5+69

X25(('& +%'05150*(5#&+ *2' (6'& 4+', (# ,'+0258' (6'+' $#,'/+9 C 0#$%/'('

,'+025%(5#& #1 2'@452'$'&(+ 5+ (6' 2'+4/(9 A,'*//<? (6' *&*/<+5+ $#,'/ 5+ *&*/<F', (#

,'('2$5&' (6#+' '/'$'&(+ #1 (6' $#,'/ (6*( %#5&( (# ';5+(5&7 2'4+*8/' 0#$%#&'&(+9

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can lead to “specification matching.” Bellinzoni, Gugini, *&, P'2&505 ^)EVMc_ ,'+0258'

#&' *%%2#*06 1#2 #8='0(3#25'&(', +<+('$+Z "#$%#&'&(+ *2' ,'15&', *&, +(#2', *+

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*1('2 2'(25'.*/9

C+ :' 6*.' */2'*,< &#(',? -`Y 2'@452'+ (6' +#1(:*2' '&75&''2 (# *%%/< +#/5,

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related to components and in that sense it distinguishes the process of “component

development” from that of “system development with components”. 

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