ISO INTERNATIONAL STANDARD 9241-2 First edition 1992-06-01 Ergonomicrequirementsforofficeworkwith visualdisplayterminals(VDTs).. Part 2: Guidance on task requirements Exigences ergonomiquespourtravail debureauavecterminauxaecrans devisualisation(TEV) Partie2:Guidegeneralconcernantlesexigencesdestaches Referencenumber ISO9241-2:1992(E) ISO9241-2:1992(E) Foreword Iso (the International Organization for Standardization) is a worldwide federationofnational standardsbodies (isOmemberbodies).Thework ofpreparing InternationalStandards isnormally carriedout through Iso technical committees.Eachmember body interested ina subject for which atechnical committee has beenestablished hasthe rightto be represented on that committee.International_organizations,govern- mental and non-governmental, in liaison with Iso, alsotake part in the work.Isocollaborates closelywiththe InternationalE Electrotechnical Commission (IEC)onallmatters of electrotechnical standardization. Draft International Standards adoptedbythetechnical committeesare circulated to the member bodies for voting. Publication as an Inter- national Standard requiresapproval by at least 75%of themember bodies casting a vote. InternationalStandardIsO9241-2waspreparedbyTechnicalCommittee Iso/TC159Ergonomics,Sub-CommitteeSC4,Signalsandcontros ISO 9241consistsofthefollowingparts，underthe general title Ergonomicrequirementsforofficeworkwithvisualdisplayterminals (VDTs): Part1:General introduction --Part2:Guidanceontaskrequirements Part 3:Visualdisplayrequirements --Part 4:Keyboard requirements --Part5:Workstationlayoutandposturalrequirements Part 6:Environmental requirements --Part7:Displayrequirementswithreflections Part8:Requirementsfordisplayed colours Part9:Requirerments fornon-keyboard input devices Part10:Dialogueprinciples CISO1992 All rights reserved. No part of thls publication may be reproduced or utllized In any form or byanymeans,eleotronloormcohanical, inoluding photooopylng and microfilm,without permlssion In writing from the publisher. InternationalOrganlzationforStandardization CasePostale56·CH-1211Geneve20·Switzerland Printed in Switzerland ISO9241-2:1992(E) 一 Part11:Usabilitystatements -Part12:Presentationofinformation ---Part13:Userguidance Part 14:Menu dialogues --Part15:Commanddialogues Part16:Directmanipulationdialogues -Part17:Formfillingdialogues ili