Ergonomic survey procedure for activity analysis

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The ergonomic survey procedure for activity analysis ( AET ) was presented in 1979 by Walter Rohmert and Kurt Landau in order to be able to carry out an ergonomic analysis of human-work systems more easily than before. For analysis, questionnaires and interviews are used, methods which the authors attribute to the Position Analysis Questionnaire ( PAQ ) by McCormic , which was translated into German as a questionnaire for work analysis (FAA) by Frieling and Hoyos .

With the AET, a bottleneck-related stress analysis of working people is carried out, based on the theory of the work system and the stress-strain concept of human activities. The AET is thus coordinated with the work design and requirements determination according to REFA and the safety analysis . It is also suitable as a method in accident research.

Thanks to the support of the then Federal Ministry for Labor and Social Affairs as well as the participation of the social partners and the then REFA policy committee “Job Evaluation”, the AET had already been tested in more than 1,000 work systems when it was published. Its development was against the background of the legal development at that time, in particular § 6 ASiG and §§ 90–91 BetrVG .

The structure of the AET

The AET is divided into three parts: A: work system, B: task analysis and C: requirements analysis.

A question grid with 216 items runs through the parts, with which the characteristics of the workplace are recorded in their characteristics. The same pattern is always followed:

MNR (feature number) MS (feature key) feature text .

The MNR is counted. The MNS can take the following forms:

  • W (importance): importance of the work - scaled from 0 (does not apply) to 5 (very high).
  • Z (duration): is based on an (assumed) shift duration of eight hours - scaled from 0 (does not apply or only very rarely) to 5 (almost continuously during the entire shift).
  • H (frequency): Describes the proportion of the activity in relation to all other activities to be described - scaled from 0 (does not apply) to 5 (very high).
  • A (alternative): scaled with 1 (available) or 0 (does not apply).
  • S (special key): Are always defined and scaled for the respective question, whereby both nominal and ordinal scales occur.

Under Characteristic Text, first a definition of the characteristic follows, then its description, possibly with examples. With MNR "S" the scale and scaling follow.

Part A: work system

This part is about:

  • Work objects , defined as “all substances, goods, energies and information that are changed in the work system according to the work task”, whereby a subdivision is first made according to material work objects, energies, information and living work objects. For all work objects it is about the time share and then specifically about the state of aggregation, surface properties, handling sensitivity, shape, size, weight, danger, etc.
  • Resources defined as "all devices or machines [...] that in a work system are involved to fulfill the task," and then in work equipment is and Other Resources (work tools such as seat, visual aid, measuring devices, etc.) divided. The equipment is examined for characteristics such as mobility, drive, etc.
  • Work environment , defined as "the totality of physical, organizational, social and economic influences that affect the working person's performance" and which is further subdivided into physical (environment such as light, climate, mechanical vibrations, noise, pressure, dust, smell, etc. . as well as risk), organizational and social work environment (temporal work organization such as shift system, night work etc .; process organization such as process principle , individual work, multiple work, structural ties etc .; organizational structure such as responsibility, authority to issue instructions, quality management, performance behavior, etc., as well as position in the communication system such as type and frequency of contacts and conflicts) as well as remuneration principles and methods (type of determination, such as legal basis, classification principles, payment method etc .; determination of the remuneration method such as summary, analysis, number of pay groups, piecework, bonus, surcharges, etc.).

Part B: Task Analysis

Since the work items relate to the work objects, the structure is similar:

  • Tasks mainly related to material work objects with items such as setting up, transporting, equipping, processing, controlling, assembling, assessing, monitoring etc.
  • Tasks mainly related to abstract work objects, such as planning, coding, transferring, arranging, mathematicizing etc.
  • Tasks predominantly human-related, such as speaking, assessing, providing, entertaining, advising, negotiating, schools, etc.
  • Number and frequency of repetition of the tasks. Since activities (e.g. painting) and the resulting tasks (e.g. preparing beforehand, cleaning afterwards) do not necessarily correspond, these items are collected separately. This includes the number of tasks and cycle duration of the basic task.

Part C: Requirements Analysis

The requirements analysis is divided into:

  • Information acquisition with recognition dimensions such as visual information acquisition (structure, pattern etc .; sense of hearing with analog items; smell and taste as well as proprioceptive information acquisition ), types of recognition (absolute and relative) and accuracy.
  • Decision like complexity, decision-making pressure and knowledge (school education, training, experience, foreign languages, further education etc.) as well
  • Action such as stress from posture and posture, holding work, dynamic muscle work, one-sided dynamic work as well as additional use of force and frequency of movement.

Survey examples

A randomly selected example for illustration:

215 S     Use of force in one-sided dynamic work
            0 does not apply
            1 very low
            2 low
            3 medium
            4 high
            5 very high Indicate
            the amount of force (relative
            to the body region used) that is normally
            exerted             by the job holder in one-sided dynamic work
got to.
            Use Fig. 1-4

            S
          O -
            | to determine the maximum force Secretarial work
            | Punch data
            | Assemble boards
            | Manufacture turned parts
            | Build up bicycle / scooter tires

Web links

Individual evidence

  1. ^ Rohmert, Walter; Landau, Kurt: The ergonomic survey procedure for activity analysis (AET): Handbook. Stuttgart: Huber, 1979. - ISBN 3-456-80705-8 .
  2. ^ Rohmert, Walter; Landau, Kurt: The ergonomic survey procedure for activity analysis (AET): feature booklet. Stuttgart: Huber, 1979 ( ISBN 3-456-80802-X ).