Human Aspects of System Design Introduction



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tarix07.04.2018
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Human Aspects of System Design

  • Introduction

    • Designing the human element into a system is paramount to its success
    • One error incorporated by the human into the system could bring a major catastrophe
    • Some Examples:

System Design Process

  • Molecularization

  • System Definition

  • Limitation & Constraints

  • Transformation

  • Iteration

  • Competition

  • Relevance



Molecularization



Characteristics of a System Design Process

  • Requirements of the system define options

  • Limitations and processes that are unsure



Characteristics of a System Design Process

  • Transformation

  • Time and Cost Constraints



Characteristics of a System Design Process

  • Iterative Cycle



Characteristics of a System Design Process



Six Major Stages in the Design Process



Six Major Stages in the Design Process

  • STAGE 1 : System Requirements

  • Determine the objectives and principles of the process

  • Objective

  • - purposes of the system

  • - general terms

  • - details what system is to do to meet objectives

  • - defines constraints

  • System Performance Specifications



Two HF activities appropriate at Stage 1

  • Two HF activities appropriate at Stage 1

  • (1) Identify all users of the machine

  • (2) Identify the activity-related needs of users which the

  • system will be responsible for



STAGE 2 : Definition of the system

  • STAGE 2 : Definition of the system

  • Define system functions to meet performance criteria



STAGE 3 : Basic Design

  • STAGE 3 : Basic Design

  • Allocation of functions to human, computer, and software



  • Some Guidelines for Designers



Guidelines to Allocate Functions

  • Guidelines to Allocate Functions

  • (1) Mandatory Allocation



(2) Balance of Value

  • (2) Balance of Value



(3) Utilitarian and cost-based allocation

  • (3) Utilitarian and cost-based allocation

  • (4) Affective and cognitive support allocations



STAGE 4 : Interface Design

  • STAGE 4 : Interface Design





STAGE 5 : Facilitator Design

  • STAGE 5 : Facilitator Design



STAGE 6 : Testing and Evaluation

  • STAGE 6 : Testing and Evaluation



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