8/7/2019 02 - Software Reliability Engineering

1/24

1

8/7/2019 02 - Software Reliability Engineering

2/24

2

8/7/2019 02 - Software Reliability Engineering

3/24

3

8/7/2019 02 - Software Reliability Engineering

4/24

4

8/7/2019 02 - Software Reliability Engineering

5/24

5

8/7/2019 02 - Software Reliability Engineering

6/24

SeeReliabilitySlidesbyClaesWohlin

6

8/7/2019 02 - Software Reliability Engineering

7/24

7

8/7/2019 02 - Software Reliability Engineering

8/24

8

8/7/2019 02 - Software Reliability Engineering

9/24

Ifpossible:

-OperaAonalprofilesshouldbegeneratedautomaAcally.Thiscouldbedonewiththe

agreementofthecustomer.-TheoperaAonalprofilesworkswellforfrequentinputs.However,theremightbe

specialcasesofinputsthatarenothappeningveryfrequently,butareofhigh

importance.Forexample,consideranaccounAngsystemwhichcollectsdatainorder

toreportatspecificpointsinAme.ThedatainputfuncAonswouldbefrequently

used,whilethisisnotthecaseforthereporAngfuncAon.I.e.,donotrelyonthe

profilealone!

9

8/7/2019 02 - Software Reliability Engineering

10/24

10

8/7/2019 02 - Software Reliability Engineering

11/24

8/7/2019 02 - Software Reliability Engineering

12/24

No,probablynot.

WithfailureanditsremovalthereliabilitydoesnotgrowatthesamerateReliabilitydoesnotnecessarilyincreasewithchangeasthechangecanintroducenewfaultsTherateofreliabilitygrowthtendstoslowdownwhenmoreandmorefaultsarediscoveredandremoved

randommodelbaseddistribuAonsmaybemoreaccurate(see:ReliabilityslidesbyClaesWohlin)

12

8/7/2019 02 - Software Reliability Engineering

13/24

No,probablynot.

WithfailureanditsremovalthereliabilitydoesnotgrowatthesamerateReliabilitydoesnotnecessarilyincreasewithchangeasthechangecanintroducenewfaultsTherateofreliabilitygrowthtendstoslowdownwhenmoreandmorefaultsarediscoveredandremoved

randommodelbaseddistribuAonsmaybemoreaccurate(see:ReliabilityslidesbyClaesWohlin)

13

8/7/2019 02 - Software Reliability Engineering

14/24

14

8/7/2019 02 - Software Reliability Engineering

15/24

15

8/7/2019 02 - Software Reliability Engineering

16/24

16

8/7/2019 02 - Software Reliability Engineering

17/24

17

8/7/2019 02 - Software Reliability Engineering

18/24

18

8/7/2019 02 - Software Reliability Engineering

19/24

19

8/7/2019 02 - Software Reliability Engineering

20/24

20

8/7/2019 02 - Software Reliability Engineering

21/24

21

8/7/2019 02 - Software Reliability Engineering

22/24

22

8/7/2019 02 - Software Reliability Engineering

23/24

23

8/7/2019 02 - Software Reliability Engineering

24/24

24