Bài giảng Phát triển, vận hành, bảo trì phần mềm: Chương 7 - ThS. Nguyễn Thị Thanh Trúc

Bài giảng Phát triển, vận hành, bảo trì phần mềm - Chương 7: Software measurement cung cấp cho người học các kiến thức về models, basic concepts, core metrics, metrics characteristics, frequently used metrics, measurement plan,... Mời các bạn cùng tham khảo.

Software Measurement

 Measuring software indicators:

metrics and methods

 Jalote-2002,

Models

Empirical

Model

Numerical Model

Results (Numerical)

Results

(Empirical)

Measurement

Interpretation

Statistical/Math Analysis

Understanding/

Refinement

Basic Concepts

• e.g size in LOC

• e.g using GQM method

• e.g defect tracking

Core Metrics

• Work and progress

• Budget and cost

• Staffing and team dynamics

• Change and stability

• Modularity

• Rework

• MTBF

Metrics Characteristics

business

Frequently-Used Metrics

• SLOC, FP, …

• Consider re-use and modification

• Separate definitions for different languages/system

• Compared to estimation (trend)

• Number of staff

• Specify experienced, support, …

• Lower in “total” estimates results in increase in “experienced”

Frequently-Used Metrics

• Number of changes in requirements and defects

• Includes developers’ understanding of requirements

• Change in requirements has to decrease and eventually freeze

• CPU, memory, IO, …

• Months/weeks of work

• Usual to fall behind initially

• Relate to actual cost

GQM Method

• Business model provides the goals

• Process model provides the details and sub-goals

Q1, Q2 Q3, Q4

GQM Steps

• High quality product

• Customer satisfaction

• Service improvement

• Inputs (resources, policies, …)

• Outputs (software, documents, …)

• Activities (analysis, design, …)

• Artefacts (knowledge, experience, meeting notes, …)

GQM Steps

each high-level goal)

• People: Trained? (related to “quality” goal)

• Reports: Signed off?

• Code: Size?

(based on entity) and then “sub-goals” (based on objective)

• Group: Documents

• Sub-goal: Improved requirement analysis

GQM Steps

related attributes

• Entity: review meetings

• Attributes: # defects found

• Metrics

Measurement Plan

Metrics

Procedures

Media

Report

Collect Goal

Data

Measurement Plan

identifies when and how data is to be collected;

validation;

Analysis Plan

presentation formats like charts

fault density for the reuse categories

bars are faults/KSLOC