|Avionics refers to "Aviation Electronics". It includes electronic systems used on aircrafts, spacecrafts and artificial satellites including communications, navigation etc. The term aviation was first coined by Philip J Klass. Avionics is a portmanteau of 2 words aviation and electronics. It plays a heavy role in modernization initiatives. Modern aviation is a substantial portion of military aircraft spending. The impact factor of journal provides quantitative assessment tool for grading, evaluating, sorting and comparing journals of similar kind. It reflects the average number of citations to recent articles published in science and social science journals in a particular year or period, and is frequently used as a proxy for the relative importance of a journal within its field. It is first devised by Eugene Garfield, the founder of the Institute for Scientific Information. The impact factor of a journal is evaluated by dividing the number of current year citations to the source items published in that journal during the previous two years.