Network+
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Computer certifications exist for a single purpose: to provide a measurable account of a specific set of skills and/or product knowledge. If you are an expert, a certification is proof. If you are not yet an expert, the path you must take to become certified will provide you with the tools to become one.

There are many paths to certification and the first step is to do some research. Spend some time defining your current skills, deciding where you want to take your career, and then look at the certifications that are applicable to your goals. There are several resources on this site that will help you decide what, if any, certifications are right for you.

The rise of the Internet has led to a new kind of certification for websites. Website certifications exist to certify the website's privacy policy, security of their financial transactions, suitability for minors, etc.

People become certified through training and/or passing an exam. Products become certified through testing. Individuals often advertise their status by appending the certification abbreviation to their name (e.g. "Jane Doe, RHCE"). Strictly speaking, most certifications do not grant post-nominals and it is usually the professional certifications that do.

A certification, or qualification, is a designation earned by a person, product or process. Certification may be a synonym for licensure but more often licensure applies only to persons and is required by law (whereas certification is generally voluntary). Certification of persons indicates that the individual has a specific knowledge, skills, or abilities in the view of the certifying body. Similarly, certification of products indicates their reputed suitability for a specified purpose (e.g. a computer system might be certified as being fully compatible with a large software package).

Certifications may be perpetual, may need to be renewed periodically, or may be valid for a specific period of time (e.g. the life-time of the product upon which the individual is certified). Although it is more common in regards to licensure, sometimes as part or whole of the renewal of an individual's certification, the individual must show evidence of continual learning — often termed continuing education — or earning continuing education units (CEU).

Certifications are offered through a certification body. This is usually a business organization. Sometimes, the organization's business is directly related to the certification, as in a software firm that certifies individuals as competent to use its products. In other cases, an organization (often a not-for-profit organization) exists wholly, or in large part, to offer a particular certification.

Whatever its nature, the certifying body determines the policies of the certification program. Potential consumers of a certification wish to understand the nature of the certifying body and the certification process. An individual who bears a designation but appears unable to perform competently is said to be a paper tiger because their resume suggests that they are more effective than they actually are.

Certifications are very common in industry, and in particular the computer industry. The National Organization of Certification Agencies (NOCA) is a US-based organization which helps certification bodies with information. Many members of the Association of Test Publishers (ATP) are certification bodies, a segment of the ATP membership which is experiencing strong growth in the late 1990s and 2000s.

The exponential growth in the number of computer-related certifications coupled with the relative ease of their acquisition has led to their devaluation in the eyes of many people in the technology field. In some cases, exam content is easily found by certification seekers (through less-than-honorable methods such as "brain dump" web sites) allowing them to gain certification without knowing, or even understanding, the concepts being tested. Certifying agencies have responded in various ways.

Some certification tests have incorporated hands-on testing, although there is no evidence that this reduces cheating or improves reliability or validity. Many have explored anti-cheating methodologies (e.g., Caveon [1] (http://www.caveon.com)) or expanded their exam content. Others have simply raised the price of certification, in a bid to reduce exam resits (and increase the profit margin per head). Faced with this difficult problem, many certifying agencies have not made any changes.

Test authors generally create incorrect response options, often referred to as distracters, which correspond with likely errors. For example, distracters may represent common misconceptions that occur during the developmental process. The construction of effective distracters is a key challenge that must be faced in order to construct multiple-choice items that possess strong psychometric properties. Well-designed distracters, considered in combination, can attract considerably more than 25% of the weakest students, so reducing the effects of guessing on total scores. The construction of such items may in some cases require some skill and experience on the part of the item developer.

People are variously susceptible to stress. Some are virtually unaffected, and excel on tests, while in extreme cases, individuals can become very nervous and forget large compontents of exam material. To counterbalance this, often teachers and professors don't grade their students on tests alone, placing considerable weight on homework, attendance, in-class discussion activity, and laboratory investigations (where applicable). Through specialized training on material and techniques specifically created to suit the test, students can be "coached" to "game" the test, significantly raising their scores without actually significantly increasing their general intelligence or knowledge.