Software Measurement - Introduction

1. Modern Aspects in Software Engineering5. Software MeasurementProf. Dr.-Ing. habil. Reiner DumkeOtto-von-Guericke-Universität MagdeburgFakultät für Informatik, Institut für Verteilte SystemeAG Softwaretechnikhttp://ivs.cs.uni-magdeburg.de/sw-eng/agruppe/

2. Software Measurement - Introduction Measurement:

3. Software Measurement - Introduction Software Measurement: „…is the process by which numbers or symbols are assigned to attributes of entities in the real world in such a way as to describe them according to clearly defined rules.“ (Fenton, 1991)

4. Software Measurement - Introduction Software Metrics: „… are used to characterize the essential features of software quantitatively, so that classification, comparison, and mathematical analysis can be applied.“ (Conte, 1992)

5. Software Measurement - Introduction • Questions: • the size of a program • the usability of a software system • the performance of a reactive system • the estimation of the development costs • the evaluation of the programmer experience • the realibility of an embedded system • the productivity of a software developer

6. Software Measurement - Introduction Software metrics example: trend analysis Cost trends development effort

7. Software Measurement - Introduction • Software metrics example: rules of thumb • One dollar software development leads to two dollar maintenance • 1 KLOC professional software includes 3 errors • productivity of a programmer: 250 LOC/month • Y2K migration: 1500 LOC/month

8. Software Measurement - Introduction • Software metrics example: formulas • Doc pages = 0.0347 * LOC0.93 • program complexity = #decisions + 1 • current effort = total_effort/(total_time2 * edt/2) • readability = 206.85 – 0.846 word_length – 1.105 sentences_length

9. Software Measurement - Introduction • Software metrics example: metrics • code metrics (Halstead, LOC) • flow graph metrics (McCabe, depth of nesting) • call graph metrics (Henry-Kafura, coupling) • structure metrics (levels, entropy) • etc.

10. Software Measurement - Introduction Halstead Metric:

11. Software Measurement - Introduction Halstead Metric:

12. Software Measurement - Introduction Halstead Metric:

13. Software Measurement - Introduction Flow graph metrics - Dijkstra structures

14. Software Measurement - Introduction Object-oriented Metrics by Chidamber/Kemerer

15. Software Measurement - Introduction Current Situation in Software Measurement

16. Software Measurement - Introduction Current Situation in Software Measurement

17. Software Measurement - Introduction Current Situation in Software Measurement

18. Software Measurement - Introduction Current Situation in Software Measurement

19. Software Measurement - Introduction Current Situation in Software Measurement

20. Software Measurement - Introduction Current Situation in Software Measurement

21. Software Measurement - Introduction Investigations in Software Measurement

22. Software Measurement - Introduction Investigations in Software Measurement

23. Software Measurement - Introduction Investigations in Software Measurement

24. Software Measurement - Measures Horst Zuse (1990): Software measures based on the measurement theory are founded in a scale which defines an homomorphism between a numerical relative and an empirical relative in order to measure based on units.

25. Software Measurement - Measures

26. Software Measurement - Measures Software metrics Software measures Software measurement Measurement based controlling

27. Software Measurement - Measures Goal Question Metric (GQM):

28. Software Measurement - Measures Goal Question Metric (GQM):

29. Software Measurement - Measures Goal Question Metric (GQM):

30. Software Measurement - Measures ISO 15939 Software Measurement Standard

31. Software Measurement - Measures Measurement Framework: CAME

32. Software Measurement - Measures Measurement Framework: Choice

33. Software Measurement - Measures Logiscope Tool: . . . Analyzability: committed(aif) -> 1 . . . committed(RECU) -> 1 1 2 3 4 5 6 Empirical method ?!

34. Software Measurement - Measures FLIGHT QUALITY = Average speed Intervall scale + average age of the crew Nominal scale + index of satisfaction (potentiell) Ratio scale + average temperatur ( C) Ratio scale + typ of the airplane - #air holes Ordinale scale - #passengers/capacity

35. Software Measurement – Measures LOC(P1 ∘ P2) = LOC(P1) + LOC(P2), LOC((P1 ∘ P2) ∘ P3) = LOC(P1 ∘ (P2 ∘ P3)) = LOC(P1) + LOC(P2) + LOC(P3), LOC(P1 ∘ P2) = LOC(P2 ∘ P1), for LOC(P1)  LOC(P2) concludes LOC(P1 ∘ P3)  LOC(P2 ∘ P3), exists a number n so that LOC(P1)  LOC(P2) and LOC(P3) > LOC(P4) leads to LOC(P1 ∘ nP3)  LOC(P2 ∘ nP4). M(P1 ∘ P2) = M(P1) + M(P2), M((P1 ∘ P2) ∘ P3) = M(P1 ∘ (P2 ∘ P3)) = M(P1) + M(P2) + M(P3), M(P1 ∘ P2) = M(P2 ∘ P1), for M(P1) M(P2) concludes M(P1 ∘ P3) M(P2 ∘ P3), exists a number n so that M(P1) M(P2) and M(P3) > M(P4) leads to M(P1 ∘ nP3) M(P2 ∘ nP4). LOC(P) [Maintenance Unit]

36. Software Measurement – Measures

37. Software Measurement – CAME tools

38. Software Measurement – CAME tools

39. Software Measurement – CAME tools

40. Software Measurement – CAME tools

41. Software Measurement – CAME tools Palm based measurement:

42. Software Measurement – CAME tools The LOC Agent (as Aglet)

43. Software Measurement – CAME tools

44. Software Measurement – CAME tools

45. Software Measurement – CAME tools

46. Questions, Remarks !!!