1. Analysis Procedures Goal Statement - Purpose of the Analysis
Examples: Process Improvement, Product Improvement,
Increase Safety, Decrease Personnel Requirements, etc
Mission Analysis
Assumptions and Constraints
Mission Segments/Phases
Evaluation Criteria
Function Determination / Allocation
Function Reallocation
Task Description / Analysis
SubTask Description
Sub-SubTask Description

2. Importance of Function & Task Analyses
Evaluate Human Factors Implications
Design Requirements and Constraints
Workload Implications
Notes:
1. Decompose to level where functions to be performed
by system can be identified.
2. Be careful that proposed design solution does not
appear to be a function description.
Meister pp 9-10, Tables 2.1 & 2.2

3. Mission Analysis (System Requirements Analysis)
What is the system supposed to accomplish?
The analyst/designer needs to know -
Specific Goals
Required Outputs
Required Inputs
System Capacities and Performance Requirements
Operating Environmental Factors
Constraints on System Operation

4. Mission Analysis Tools
Mission Profile
Graphic Description (Example - Flight Profile)
Mission Scenario
Verbal Description - Summarizes typical
assumptions, environments, operations.
Mission Segment
Time period of coherent activities
with definite beginning and ending points.
Indicates interaction among system elements.
Aids in segmenting mission.
Purpose: Helps develop smaller, more manageable units for analysis.

5. Determination of Functions
Identify and Describe Functions - by
Determining Function Inputs and Outputs
Establishing Functional Performance Criteria
Preparing Functional Flow Diagrams
Function Examples:
To Detect
To Repair
To Analyze
Functions - Can be
Instantaneous (Start Engine)
Prolonged ( Monitor Radar Screen)
Complex (Analyze Equipment Malfunction)
Note: Function translates inputs into outputs.
Functions are hierarchical (that is, are layered).
Difficult to differentiate between functions and tasks ---
functions fade into tasks.

6. Function Performance Criteria
Yardstick used to measure/predict whether or not the system/function meets the performance requirements.
Criteria can range from gross to finely detailed.
Functional Performance Criteria must be stated in terms of those test results that must be satisfied in order for the system/function to meet the performance requirements.
Provides the basis for preparing the Functional Flow Diagram.

7. Functional Flow Diagram
Determine the functions that have already been allocated.
Describe the various different ways that each unallocated function might be accomplished.
Establish the weighting criteria for comparing the alternatives.
Compare each of the alternative against one another.
Select the most cost-effective design.
Meister pp 26-28, Tables 2.4, 2.5, 2.6

8. Task Description / Identification
Examine each selected design alternative.
List in sequence all the actions that must be performed to accomplish the functional element.
Categorize actions in terms of whether they are
operator or maintainer activities; and by the
hardware/software subsystems to which they belong.
Describe each action in terms of a behavioral verb (see next slide).
Break tasks down into subordinate tasks by specifying inputs and outputs for each task/subtask.
Meister p 36, Table 2.7

9. Behavioral Verbs Example - to turn on, to monitor, to disassemble
Action
Example - to turn on, to monitor, to disassemble
Equipment Acted Upon
Example - switch, motor, display
Consequence of Action
Example - voltage display stabilized
Stimulus that Initiates the Action
Example - pilot’s command
Feedback Information Resulting form Task Performance
Example - aircraft heading 320 degrees
Criterion of task accomplishment
Example - vehicle stopped/parked with 3 feet of marker

10. Task Analysis Design Questions Manning Questions Training Questions
Test and Evaluation Questions
Meister pp 31-32
See Lector Notes page 1 of 7

11. Design Questions What tasks need to be performed?
How critical is each task?
In what sequence must the tasks be performed?
What control activations are required?
etc, etc, etc
Meister pp 33-35
See Lector Notes page 4 & 5 of 7

12. Manning Questions How many people are required to perform the task?
What skill levels are required?
Meister pp 35-37
See Lector Notes page 6 of 7

13. Training Questions
On what behavioral dimensions are the tasks performed?
How difficult or complex is each task?
What information is required to perform the task?
etc, etc, etc
Meister pp 37-38
See Lector Notes page 7 of 7

14. Test and Evaluation Questions
What are the performance criteria for the task or job?
Meister p 38
See Lector Notes page 7 of 7