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Equivalence classes
… 15 16 17 18 19 20 21 … 
Boundary 
No loan 
Loan 
applied 
In the application of equivalence 
classes, the entire value range of 
a parameter is partitioned into 
classes, in which the system 
behaviour is similar (equivalent).
… 15 16 17 18 19 20 21 … 
Boundary 
No loan 
Loan 
applied
Help, my 
bahaviour 
changes 
… 15 16 17 18 19 20 21 … 
Boundary 
No loan 
Loan 
applied
… 15 16 17 18 19 20 21 … 
Boundary 
No loan 
Loan 
applied
No loan 
18
No loan 
18 
Boundary value
No loan 
18 
Boundary value NOT included 
in this equivalence class
No loan 
18 55 
Standard loan 
Boundary value included in 
this equivalence class
No loan 
Standard loan 
Expensive loan 
18 55
Assumption: each value taken 
from a class has the same chance 
of finding a fault and that testing 
with several values from the 
same class barely increases the 
chances of fault detection. 
No loan 
Standard loan 
Expensive loan 
18 55 
16 
32 
64 
Possible values to chose 
from the equivalence classes

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Storyboard equivalence classes

  • 2. … 15 16 17 18 19 20 21 … Boundary No loan Loan applied In the application of equivalence classes, the entire value range of a parameter is partitioned into classes, in which the system behaviour is similar (equivalent).
  • 3. … 15 16 17 18 19 20 21 … Boundary No loan Loan applied
  • 4. Help, my bahaviour changes … 15 16 17 18 19 20 21 … Boundary No loan Loan applied
  • 5. … 15 16 17 18 19 20 21 … Boundary No loan Loan applied
  • 7. No loan 18 Boundary value
  • 8. No loan 18 Boundary value NOT included in this equivalence class
  • 9. No loan 18 55 Standard loan Boundary value included in this equivalence class
  • 10. No loan Standard loan Expensive loan 18 55
  • 11. Assumption: each value taken from a class has the same chance of finding a fault and that testing with several values from the same class barely increases the chances of fault detection. No loan Standard loan Expensive loan 18 55 16 32 64 Possible values to chose from the equivalence classes