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2 SEI 24.3 ...

30 60 30% 70% Myers 1979,Boehm 19 87 Yourdon 19 89 30% Boeing Computer Services Boeing Glass 1982 , ...

3.3 1.8 Card 1987 20% 60% , 1000 10000 4000 2 2 1000 1 2 , , , , , 24.4 ...

...

25.l 25.2 25.3 25.4 25.5 25.6 25.7 25.8 23 24 27 26 3 , 26 25.l , (Card 1987) ( ) 50 60 Jones 1986 , ...

,? Glend Myers 15 5 9 50 , 25 1 8 35 , ...

25 l^ 25.2 ...

25.3 20 26 2620 20 26 2620 20 26 1010 10 10 = 2620 26^20 1010 =10^66 1066 1 l 10 if while if while 25 1 25 l 1 if while repeat ...

Pascal Statement1 1 Statement2 if X 10 then if 2 begin Statement3 End 1 Statement4 1 if 2 2 if X 10 ) if X 10 Pascal 1 { Compute ...

25 26 determine IRA contribution 27 IRA : 0 28 if EligibleForIRA EmPloyee ID then if 6 29 begin 30 IRA : IRAContribution Employe ...

Boris Beizer 1990 for for 2 ...

if (Condition 1) x = a; else x = b; if (Condition 2) y = x + 1; else y = x – 1; 1 2 1( 1 2 ) 2( 1 2 ) 1 2 x = a; y = x + 1; and ...

7 15 30 8 15 35 9 21 35 25.3 45 Pascal 9 Employee[ID].SSWithheld < MAX_SOCIAL_SECURITY Employee[ID].SSWithheld MAX_SOCIAL_SEC ...

MAX Boundary Boundary below Max Max above Max 25.3 45 Pascal Employee[ID].SSWithheld > MAX_SOCIAL_SECURITY 1 1 Employee[ ID]. ...

2 12 13 32,768 14 15 16 500 17 500 ...

1239078382346 1 39,078.38 34,078.38 20,000 0 2 39,078.73 25.4 ...

1000 10 100 80% 20% Endres 19 75 Gremillion 1984 Boehm 198 7 5 0% 10% Endres 1975 Gremillion 1984 20% 80% 20% 20% 60 IBM OS/360 ...

4.71% Beizer 50% Beizer Beizer 85% Endres1975 97 ( Curits , Krasner Iscoe1988) 95% 2% l% (Brown sampaon19733,Ostrand Weyuker1984 ...

(100 0 ) 75% 10% 15% Jones1986a 40 % 75% Grady 1987 Basili Perricone1984 Hewlett-Packard 25% 50% 1 2 25-2 15 20 1 10 10 1000 10 ...

80 ,000 740 150 Mills 3 4 100 10 25.5 ...