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System Dependability Evaluation(1)
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Lecture Structure
- Software Different Story (00:00:01)
- Software Reliability Assessment (00:07:24)
- Software metric models Derive knowledge from static code properties (00:07:24)
- Black box models No details known observations from testing or operation (00:07:24)
- Dimensions of Black Box Models et (00:08:24)
- Software Reliability Growth Models (00:08:25)
- Example Early phase detects faults that prevent the application from running (00:08:25)
- s shaped (00:08:25)
- Basic assumptions (00:08:25)
- Software Reliability Growth Models by and Wilson (00:08:26)
- Reliability Growth Model Analysis by Tandem (00:08:27)
- Software Reliability th Models (00:08:29)
- Model (00:08:30)
- Example (00:08:48)
- Basic Execution Time Model (00:08:49)
- Failure changes with a rate depending on the number of (00:08:49)
- Exponential distribution of resulting failure intensity function (00:08:49)
- LL Mean number of expected failures in an time interval (00:08:52)
- rate of failures per (00:08:52)
- Reliability Growth Model Analysis by Tandem (00:09:55)
- Analysis of 9 different growth models in comparison with real data (00:09:55)
- Technical report 96 1 by Tandem 1996 (00:09:55)
- During testing the model should predict test effort for some quality level (00:09:56)
- Tests represent operational pro e Size and transaction volume of production (00:09:56)
- Each unit of time is equiv Corner tests are more likely to find defects (00:09:56)
- Box Approach Software Metric Models (00:09:57)
- Reliability Growth Model Analysis by Tandem (00:09:58)
- a G O All results same as G O model (00:09:58)
- Model Name Weeks 17 Weeks 14 Week 17 Weeks Weeks (00:09:58)
- Box Approach Software Models (00:10:00)
- standard from 0 3 to 2 bugs per 1000 lines of code (00:10:00)
- Most basic approach lines of code (00:10:00)
- Root n m mums mm (00:16:45)
- cane Ev Language me Jes amen sewer (00:16:47)
- Example C Vis Tool for Java (00:17:18)
- Metric (00:18:02)
- y m rum mum Hun Q (00:23:04)
- Amiga formal m n Hun O (00:23:10)
- Metric (00:23:19)
- Difficulty level D Program level L 1 (00:23:19)
- Describes size of an implementation by vocabulary and by program length (00:23:19)
- Program volume V N (00:23:19)
- Describes mental effort to re create the software (00:26:00)
- Program volume V 1 N (00:26:18)
- Phantom edge for Complexity strongly connected graph (00:30:13)
- State Based Software Model (00:33:58)
- Amiga Mme Q (00:35:30)
- 6 rum Emma mum a x en Hun Q (00:35:31)
- 6 mm Emma s w m4 e Hun Q va1 k v (00:35:32)
- Dependable Systems (00:35:34)
- Qualitative Dependability Investigation (00:37:19)
- Root Cause Analysis (00:39:03)
- RCA Whys (00:40:50)
- Qualitative Dependability Investigation (00:43:26)
- Root Cause Analysis (00:43:27)
- RCA (00:44:21)
- RCA Because Analysis (00:45:10)
- 0 If no for two effects then the cause is a necessary causal factor (00:45:10)
- test 1975 (00:45:10)
- Output is directed acyclic Why Because graph (00:45:10)
- Example Peter B (00:48:44)
- RCA Diagram (00:49:48)
- Place Procedures (00:51:04)
- quail (00:51:04)
- Bottom Up Find all the effects caused by all failure modes (00:55:04)
- Examples performance noise (00:55:04)
- Effect analysis for failure modes what happens to the (00:55:04)
- Examples Electrical short corrosion deformation (00:55:04)
- Steps (00:55:56)
- 9 Risk priority number 1 S X O X D Criticality 1 S X O (00:55:56)
- 6 Identify root causes per failure mode rank by probability of occurrence (00:55:56)
- 5 Perform severity rating per effect From insignificant to catastrophic add only (00:55:56)
- 3 Per function identify all ways a failure could happen potential failure modes (00:55:56)
- nm mum emu emu Hun O (00:59:06)
- Steps (00:59:25)
- 9 Risk priority number S X O D Criticality S X O (00:59:25)
- 6 Identify root causes per failure mode rank by probability of occurrence (00:59:25)
- 5 Perform severity rating per effect From insignificant to catastrophic add only (00:59:25)
- 3 Per function identify all ways a failure could happen potential failure modes (00:59:25)
- i inns Puma Q (00:59:44)
- d hymn a am nm mm mum 5 Hum Q (00:59:46)
- E2 am Q Bank (00:59:47)
- d hymn a am nm mm mum 5 Hum Q (00:59:48)
- Army mm mm magnum Hun Q (00:59:56)
- i en mm A mane Dam Hun 0 (01:01:37)
- rum Jam 1 Fe mu m Hun Q (01:01:47)
- rum Jam 1 Fe mu m Hun Q v emm4 k v (01:01:49)
- mag nm Fume nun Q (01:01:56)
- mag nm Fume nun Q (01:01:58)
- V U fun (01:02:21)
- Example NASA Spacecraft Severity Ratings (01:03:53)
- Category 4 Minor Failure modes that could result in insignificant or no loss to (01:03:53)
- Category 3 Significant Failure modes that could cause degradation to mission (01:03:53)
- Critical Failure modes of identical or equivalent redundant hardware (01:03:53)
- Category 2 Critical Failure modes could result in loss of one or more mission (01:03:53)
- I Category Catastrophic modes of identical or redundant (01:03:53)
- Category 1 Catastrophic modes that could result in serious injury or loss of (01:03:53)
- Example NASA Spacecraft Ground Rules for Failure lode Analysis (01:04:37)
- Special emphasis will be directed towards identification of single failures that could (01:04:37)
- All inputs software to the item being analyzed are present and (01:04:37)
- E am o e NASA Spacecraft Flow Diagram of Overall System Analysis (01:06:21)
- Variations (01:06:55)
- Hazard Studies (01:07:45)
- Secondary keywords When combined with a primary keyword (01:08:50)
- Primary keywords Focus on a aspect (01:08:50)
- Plant Example Secondary (01:11:51)
- Usually used when that a step 15 (01:11:51)
- The Dart g an aw m a p (01:11:51)
- The occurs but not the mended Q Other could a leak or (01:11:51)
- occurs Flow In a (01:11:51)
- A decrease the g Pressure Less (01:11:51)
- Secondary keywords When combined with a primary keyword (01:11:55)
- Examples for Java Language Definition analysis (01:11:55)
- Primary keywords Focus attention on a particular aspect of the (01:11:55)
- Plant Example Secondary Keywords (01:15:10)
- Early (01:15:10)
- The Dart of me time veg an av w a (01:15:10)
- occurs In a product stream (01:15:10)
- The Q of the occurs e g Flow Reverse (01:15:10)
- A occurs Temperature More (01:15:10)
- or the aspect not 4 NU (01:15:10)
- Plant Example Combinations (01:15:11)
- for Java Language Specification Kim Clark Secondary Keywords (01:17:19)
- a way am (01:17:19)
- The same m (01:17:19)
- A other than the ed but (01:17:19)
- s but (01:17:19)
- A me data awe too or cur of (01:17:19)
- Procedure (01:17:20)
- Plant Example Secondary Keywords (01:17:21)
- The GUN pan me Q an cw u a (01:17:21)
- g Plum Also u m a (01:17:21)
- Secondary keywords When with a primary keyword (01:17:22)
- Primary keywords Focus attention on a particular aspect of the (01:17:22)
- Plant Example Combinations (01:17:35)
- for Java l Language Specification Kim Clark Secondary Keywords (01:18:01)
- I Procedure (01:18:05)
- for Java Language Specification Kim Clark Deviants Example (01:18:06)
- may the mm me Q um 1 value of me (01:18:06)
- Class 5 T is char s is (01:18:06)
- PART OF (01:18:06)
- consequences widening femme regards A M ha g mg pf (01:18:06)
- The were become For a field b changed (01:18:06)
- WIDENING (01:18:06)
- The g In (01:18:06)
- A h s H lass variable unable causing (01:18:06)
- Th s arm 15 hue Lb should be an unable (01:18:06)
- Documentation (01:19:28)
- for Java Language Specification Kim Clark 1cDermid Secondary Keywords (01:19:30)
- A result other the achieved Du (01:19:30)
- Reverse flow How of wrong d wrong (01:19:30)
- is results (01:19:30)
- No pan of me 1 e en No use (01:19:30)
- Plant Example Combinations (01:19:31)
- Procedure (01:19:32)
- Documentation (01:19:35)
- Cause causes for the (01:19:35)
- 0 Apply in a systematic way all relevant keyword combinations to the design (01:19:35)
- Software Process Evaluation and Improvement (01:20:24)
- Supplier sourcing (01:20:24)
- by Software Engineering Institute extended to (01:20:24)
- Most famous approach is the Capability Maturity Model (01:20:24)
- Maturity Levels (01:20:26)
- Software Process Evaluation and Improvement (01:21:00)
Keyword
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