MAP-01-011 HFI Technical Guide - Human Factors Integration ...

MAP-01-011 – HFI Technical Guide (STGP 11)whether any errors are credible or not. For each credible error, the analyst thenrecords the system cause or PEM and error reduction guidelines (both of whichare provided in the HEIST tables) and also the error consequence.Although it can be used as a stand-alone method, HEIST is also used as part ofthe HERA ‘toolkit’ methodology (DTC114 - Kirwan 1998b) as a back up check forany errors identified. It is also suggested that the HEIST can be used by just oneanalyst and also that the analyst does not have to be an expert for the systemunder analysis (DTC108 - Kirwan 1994).• Advantages• As HEIST uses error identifier prompts based upon the SRK framework,the technique has the potential to be exhaustive.• Error identifier prompts aid the analyst in error identification.• Once a credible error has been identified, the HEIST tables provide theEEM’s, PEM’s and error reduction guidelines.• Disadvantages• HEIST is very time consuming in its application.• The need for an initial HTA creates further work for HEIST analysts.• Although the HEIST tables provide error reduction guidelines, these arevery generic and not really specific nor of any use e.g. ergonomic design ofequipment and good system feedback.• A HEIST analysis requires Human Factors/psychology professionals.• No validation evidence is available for the HEIST.• No evidence of the use of HEIST is available in the literature.• Many of the error identifier prompts used by HEIST are repetitive.• It has been reported that HEIST performed poorly when used to predictpotential design induced error on the flight task ‘Land aircraft at NewOrleans using the auto-land system’. HEIST performed the worst out ofHET, SHERPA, Human Error HAZOP and HEIST.A3.10.10 THEAThe Technique for Human Error Assessment (THEA) was developed primarily toaid designers/engineers in identifying potential problems between users andinterfaces in the early design stages of systems design. The technique is ahighly structured one that employs cognitive error analysis based upon Norman’s(No citation reference - 1988) action execution model. THEA also utilises ascenario-based analysis, whereby the analyst exhaustively describes thescenario under analysis before any analysis is carried out. The scenarioMay 2006 Page A3-98 Issue 4