Phát triển vận hành bảo trì phần mềm - Chương 7

Chia sẻ: Hồ Quang Tín | Ngày: | Loại File: PPT | Số trang:14

Thêm vào BST

Báo xấu

64
lượt xem 6
download

Download Vui lòng tải xuống để xem tài liệu đầy đủ

Measurement Plan a name and definition for each unique metric; the classification for each metric; an association point in product development that identifies when and how data is to be collected; definitions of the data collection forms; the procedures for data reporting, collection,and validation;

Chủ đề:

Bình luận(0) Đăng nhập để gửi bình luận!

Lưu

Nội dung Text: Phát triển vận hành bảo trì phần mềm - Chương 7

Software Measurement Measuring software indicators: metrics q and methods Jalote-2002, q Ali Arya, 2003 Software Project Management, Measurement Slide 1
Models Empirical Numerical Measurement Model Model Statistical/Math Understanding/ Analysis Refinement Results Results (Empirical) (Numerical) Interpretation Ali Arya, 2003 Software Project Management, Measurement Slide 2
Basic Concepts Project planning and tracking need measurement q Purpose = control and visibility q Metrics (Measures), quantified process attributes q • e.g. size in LOC Plan based on organizational model and goals q • e.g. using GQM method Continuous and including phase information q • e.g. defect tracking Ali Arya, 2003 Software Project Management, Measurement Slide 3
Core Metrics Management q • Work and progress • Budget and cost • Staffing and team dynamics Quality q • Change and stability • Modularity • Rework • MTBF Ali Arya, 2003 Software Project Management, Measurement Slide 4
Metrics Characteristics Meaningful to all people involved q Quantifiable correlation between process and q business Objective and clear q Displaying trends (extrapolation) q Natural by-product of process q Automation supported q Correlated q Ali Arya, 2003 Software Project Management, Measurement Slide 5
Frequently-Used Metrics Size q • SLOC, FP, … • Consider re-use and modification • Separate definitions for different languages/system • Compared to estimation (trend) Personnel q • Number of staff • Specify experienced, support, … • Lower in “total” estimates results in increase in “experienced” Ali Arya, 2003 Software Project Management, Measurement Slide 6
Frequently-Used Metrics Volatility q • Number of changes in requirements and defects • Includes developers’ understanding of requirements • Change in requirements has to decrease and eventually freeze Computer Resource Utilization q • CPU, memory, IO, … Schedule q • Months/weeks of work • Usual to fall behind initially • Relate to actual cost Ali Arya, 2003 Software Project Management, Measurement Slide 7
GQM Method Goal-Question-Metric q Goal-oriented measurement q Based on Business and process model q • Business model provides the goals • Process model provides the details and sub-goals Goals Q1, Q2 Q3, Q4 M1, M2, M3 M4, M5, M6 Ali Arya, 2003 Software Project Management, Measurement Slide 8
GQM Steps 1- Define business goals q • High quality product • Customer satisfaction • Service improvement 2- Provide the process model (made of entities) q • Inputs (resources, policies, …) • Outputs (software, documents, …) • Activities (analysis, design, …) • Artefacts (knowledge, experience, meeting notes, …) Ali Arya, 2003 Software Project Management, Measurement Slide 9
GQM Steps 3- Prepare general questions about entities (for q each high-level goal) • People: Trained? (related to “quality” goal) • Reports: Signed off? • Code: Size? 4- Group the related questions into “groups” q (based on entity) and then “sub-goals” (based on objective) • Group: Documents • Sub-goal: Improved requirement analysis • Question: Requirement document ready and clear for design? Ali Arya, 2003 Software Project Management, Measurement Slide 10
GQM Steps 5- Find the entities under question and all the q related attributes • Entity: review meetings • Attributes: # defects found 6- Formalized measurement goals q 7- Quantifiable questions q • Metrics 8- Data elements q Ali Arya, 2003 Software Project Management, Measurement Slide 11
Measurement Plan Report Metrics Collect Goal Procedures Data Media Validate Ali Arya, 2003 Software Project Management, Measurement Slide 12
Measurement Plan a name and definition for each unique metric; q the classification for each metric; q an association point in product development that q identifies when and how data is to be collected; definitions of the data collection forms; q the procedures for data reporting, collection,and q validation; Ali Arya, 2003 Software Project Management, Measurement Slide 13
Analysis Plan The last deliverable of MP is “analysis plan” q AP describes how to analyze measured data into q presentation formats like charts. fault density for the reuse categories. bars are faults/KSLOC Ali Arya, 2003 Software Project Management, Measurement Slide 14