Questions

Protons carry a positive electrical charge, electrons carry a negative electrical charge and neutrons carry no electrical charge at all. The protons and neutrons cluster together in the central part of the atom, called the nucleus, and the electrons 'orbit' the nucleus.

In chemistry rusting is called as oxidation. Oxidation is a chemical process where metal gains oxygen and become oxide. In rusting the Iron ore make a chemical reaction with the oxygen in the presence of water and environmental or atmospheric moisture to produce an Iron oxide. Iron oxide is otherwise called as rust.

The rusting of iron is a chemical change because it is two substances reacting together to make a new substance. 

Rusting would only be a physical change if iron molecules remained pure iron throughout the process.

The primary use of iron ore is in the production of iron. Most of the iron produced is then used to make steel. Steel is used to make automobiles, locomotives, ships, beams used in buildings, furniture, paper clips, tools, reinforcing rods for concrete, bicycles, and thousands of other items.

Capability Maturity Model (CMM) is a model of 5 levels of process 'maturity' that determine effectiveness in delivering quality software. The 5 levels of CMM are described as below:

Level 1: Initial: - characterized by chaos, periodic panics, and heroic efforts required by individuals to successfully complete projects. Very few or none of the processes are in place.

Level 2: Repeatable: - Software Project Tracking, Requirements Management, Realistic Planning and Configuration Management Processes are in place; successful practices can be repeated.

Level 3: Defined: - Standard Software Development and Maintenance Processes are integrated throughout an organization. A Software Engineering Process Group is in place to oversee software processes, and training programs are used to ensure understanding and compliance.

Level 4: Managed: - Metrics are used to track productivity, processes, and products. Project performance is predictable, and quality is consistently high.

Level 5: Optimizing: - The focus is on continuous process improvement. The impact of new processes and technologies can be predicted and effectively implemented when required.

Any organization can start from any level, but its motto is to reach level 5; where the focus is continuous process improvement. By doing this, high quality s/w delivery is assured.

From this, we can see that the whole essence of CMM or CMMI is to produce quality software. It targets the whole organizational practices (or processes), which are believed to be the best across industries. Testing is part of Quality Assurance. CMM levels play an important role in an organization’s Quality Assurance effort. Thus testing plays an important role in determining CMM level.