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quality model has been adopted by China's national standards GB/T16260 - 2002 Information Technology Software Product Evaluation Quality Characteristics and Guidelines for Their Use. 2.8 Software Process Improvement Software Process Capability Maturity Model (CapabilityMaturityModel, CMM) and Capability MaturityModelIntegration ( CapabilityMaturityModelIntegration, CMMI)

Software quality assurance refers to the planned and organised activities carried out to ensure that a software system or software products fully meet the required quality, these activities are planned and organised throughout all phases of software production, i.e. the entire life cycle. There are two types of software quality characteristics metrics: predictive and acceptance. Commonly used international software quality models are ISO/IEC9126 and the McCall model.

1) Cleanroom method cleanroom software engineering method is a formal method, which can produce high-quality software. Cleanroom method is a strict software engineering method. It is a software process model that emphasizes mathematical verification of correctness and certification of software reliability. Its objectives and results have a very low error rate, which is difficult or impossible to achieve by using non formal methods.

Modeling tools, software development tools, software testing tools and project management tools. 2.1 software development method software development method is a subject whose research object is software development method. From different angles, software methodology can be classified as follows: from the perspective of development style, it can be divided into top-down and bottom-up development methods; From the nature, it can be divided into formal and non formal methods

, process view, implementation view, deployment view and use case view. 2.10 Components and Software Reuse A component (component) is a relatively functionally independent unit of software with reusable value. In the object-oriented approach, a component consists of a set of objects containing a collection of collaborative classes that work together to provide a system functionality.1) Software reuseReusability is the extent to which a system and/or its components can be reused in other systems.

The UML has three basic constructs These are things, relationships and diagrams. Public mechanisms are public UML methods for achieving specific goals and include four main types of specification (detailing), modification, public classification (generic division) and extension mechanisms. Rules, the semantic rules that UML uses to describe things are named things, relations and diagrams respectively.

Software architecture definition, typical architecture, software architecture design method, software architecture analysis and evaluation, software middleware. 4) Object oriented system analysis and Design: basic concept of object-oriented, unified modeling language (UML), visual modeling, object-oriented system analysis, object-oriented system design.

Software requirements analysis and definition, software design, testing and maintenance, software reuse, software quality assurance and quality evaluation, software configuration management, software development environment, and software process management. 2) Technical knowledge of software components: components and their importance in information system projects, common component standards (COM / DCOM / COM +, CORBA and EJB).

G2B (government to business, government to citizen) G2C (government to citizen) 3) e-commerce B2B (business to business, business to enterprise) B2C (businesstocustomer, business to individual) C2C (customertocustomer, individual to individual) Chapter 2 basic knowledge points of system development

Supply chain management (SCM), business intelligence (BI) and enterprise portal (EP) can be divided into three categories: Information Portal (EIP), knowledge portal (EKP) and Application Portal (EAP) 2) e-government G2G (government to government)

subsequently captured by the enemy, the commandos had to suspend the original goal and go to rescue their teammates, rescue them and resume the operation. After destroying the high-voltage towers, they rendezvoused with the U.S. sniper team. The team then proceeded to the missile base. Suddenly, two loud noises, the sky was also reflected in the bright and blinding light, the commandos looked up, two intercontinental ballistic missiles lifted off. It turns out that Zakhaev, enraged at the loss of his son, and with his broken arm, has launched two ICBMs with nuclear warheads at the U.S. mainland!

Can not have to solve them all Our target TV station is on the left front. TV station parking lot will have marines to reinforce, the enemy to them on it, follow the lieutenant to the side door of the TV station, wait for the door to blow open and rush in, be careful of the corridor of the enemy, come to the office area, opposite the equipment room has a lot of enemies, extermina