Adonis Diaries

Posts Tagged ‘human-machine performance criteria

Process of system/mission analyses? What are the phases?

Written in April 14, 2006

Systems, missions, and products that involve human operators to run, maintain, and keep up-to-date, as societies evolve and change, need to be analyzed at intervals for its consistency with the latest technology advances, people’s expectations, government regulations, and international standards.

To that end, the latest development in the body of knowledge of human physical and cognitive capabilities, along with the latest advancement in the methods applied for analyzing and designing systems have to be revisited, tested, and evaluated for better predictive aptitude of specific human-machine performance criteria.

This article is a refresher tutorial of the necessary sequence of human factors methods offered to analyze each stages in system development.

In general, the basic milestones in system development begin with the exploration concept, demonstration of the concept, validation, full-scale engineering development, testing and debugging for errors and malfunctions, production, and finally operations and support systems for marketing.

Each one of these stages requires the contribution of human factors professionals and experts from the extensive array of methods they dispose of and are trained for, to their vast store of data on human capabilities and limitations, and to their statistical and experimental formation.

Human factors professionals can also contribute to the baseline documentation, instructions, training programs, and operations manuals.

There is a mission for each stage of development concerning the end product of the stage to the next and the sequence follows 7 steps.

The first step is constituted of four analyses requirements; mainly, operational or the projected operations that will confront operators and maintainers, then comparing similar systems in operations and functions, measuring and quantifying the activities involved in the operations, and then identifying the sources of difficulties or critical incidents that may have to be overcome among the interactions of operators and machines.

The second phase is to figure out the flow of functions and the kinds of action/decision or binary choices at each junction of two successive functions. There are no equipments in mind at this phase of analyses.

The third phase is concerned with the types of information necessary to undertake each action identified in the second phase.

The fourth phase is the study of allocating operators to sets of functions and activities and how many operators and skill levels might be needed to fulfill the mission.

The fifth phase is to construct detailed analyses of the required tasks for each activity/function and basically trying to integrate among people, software, and hardware for smooth operations.

The sixth phase might call for an assortment of methods in order to collect detailed data for the network of tasks such as faulty events, mode of failures, the effects or seriousness of the failures, timeline from beginning to ending a task/activity, how the tasks are linked and how often two tasks come to be interacted, simulation techniques whether a computer simulation of virtual real world or prototyping, and eventually conducting controlled experimentations when the previous traditional methods cannot answer specific problems of cause and effects among the variables.

The seventh and final phase in the analysis of a stage of development is to study the sequence of operations and the physical and mental workload of each operator and to finalize the number and capabilities of the crew operating as a team.

The last five phases are time consuming and it is imperative that the first two phases be well planned, analyzed and firm decisions made for the remaining phases in funding, duration of study, and level of details.

In all these phases human factors are well trained to undertake the analyses because they have the knowledge and methods to extract the capabilities and limitations of human operators interacting with the software and hardware so that the design, trade-off studies, and prediction of human performance match the requirements for achieving a mission.

The ultimate output/product of the sequence of analyses becomes inputs to specifications, reviews, and for design guidelines.


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adonis49

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