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The practise of engineering is carried out by professionals who invent, design, analyse, build and test machines, complex systems, structures. gadgets and materials in order to meet functional objectives and requirements while taking into consideration the constraints imposed by practicality, regulation, safety, and cost. Engineers are also known as practitioners of engineering. It is derived from the Latin words ingeniare ("to create, produce, contrive, devise") and ingenium ("to invent, design, devise"), which mean "to generate, generate, contrive, devise" ("cleverness"). Fundamental qualifications for engineers typically include a four-year bachelor's degree in an engineering discipline, or a master's degree in an engineering discipline in some jurisdictions, as well as four to six years of peer-reviewed professional practise (which culminates in a project report or thesis) and successful completion of engineering board examinations.

A relationship is formed between scientific discoveries and their future applications to human and commercial requirements, as well as the overall quality of life. Engineers are responsible for this connection.

Engineers develop new technological solutions. During the engineering design process, the responsibilities of the engineer may include defining problems, conducting and narrowing research, analyzing criteria, finding and analyzing solutions, and making decisions. Much of an engineer's time is spent on researching, locating, applying, and transferring information. Indeed, research suggests engineers spend 56% of their time engaged in various information behaviours, including 14% actively searching for information.

Engineers must weigh different design choices on their merits and choose the solution that best matches the requirements and needs. Their crucial and unique task is to identify, understand, and interpret the constraints on a design in order to produce a successful result.

Engineers apply techniques of engineering analysis in testing, production, or maintenance. Analytical engineers may supervise production in factories and elsewhere, determine the causes of a process failure, and test output to maintain quality. They also estimate the time and cost required to complete projects. Supervisory engineers are responsible for major components or entire projects. Engineering analysis involves the application of scientific analytic principles and processes to reveal the properties and state of the system, device or mechanism under study. Engineering analysis proceeds by separating the engineering design into the mechanisms of operation or failure, analyzing or estimating each component of the operation or failure mechanism in isolation, and recombining the components. They may analyze risk.

Many engineers use computers to produce and analyze designs, to simulate and test how a machine, structure, or system operates, to generate specifications for parts, to monitor the quality of products, and to control the efficiency of processes.