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AE 424 Final > System Requirements > Flashcards

System Requirements Flashcards

(64 cards)

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1
Q

____ Capture the understanding of what is to be done (plural)

A

Requirements

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2
Q

Poor ____ are the single biggest problem for projects

A

Requirements

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3
Q

Requirements define:

A
  1. ‘What’ is to be done
  2. ‘How well’ it is to be done
  3. Under ‘what conditions’
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4
Q

Requirements drive ______

A

everything

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5
Q

True or False: a requirement may be a contractually binding statements

A

True

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6
Q

True or False: a requirement can not be documentation of a problem space

A

False

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7
Q

True or False: A requirement can not be a method by which a team communicates

A

False

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8
Q

NASA Requirement Conventions:

A

Requirements are binding - SHALL
Facts or declaration - WILL
Goals/Non-Mandatory - SHOULD

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9
Q

NASA Requirement Don’ts:

A

DO NOT USE:

must, have to, ought to, etc

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10
Q

Types of Requirements: (list them)

A
  1. Functional
  2. Performance
  3. Constraints
  4. Verifications
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11
Q

Define Requirement Type: Functional

A

Requirement which defines WHAT an item must do.

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12
Q

Define Requirement Type: Performance

A

Requirements which define and quantify HOW WELL an item must accomplish a task.

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13
Q

Define Requirement Type: Constraint

A

Requirements that capture operational, environmental, safety, or regulatory constraints (WHAT CONDITIONS)

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14
Q

Define Requirement Type: Verification

A

Requirements that capture how confidence will be established about the system performance in its intended environment.

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15
Q

Other types of requirements:

A 
Stakeholder needs
System Reqs
Imposed Reqs (env.)
Interface Reqs
Regulation Reqs
Implementation Reqs (we can't ride flying carpets to the moon)
Verification Reqs
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16
Q

Cost incurred _____ ______ over the system maturity period. (Increase/Decrease, Sharply, Gradually)

A

Increases Gradually

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17
Q

System-Specific Knowledge _____ ______ over the system maturity period. (Increase/Decrease, Sharply, Gradually)

A

Increases Gradually

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18
Q

Commitment to Technology Configuration, Performance, and Cost _____ ______ over the system maturity period. (Increase/Decrease, Sharply, Gradually)

A

Increases Sharply

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19
Q

Ease of change _____ ______ over the system maturity period. (Increase/Decrease, Sharply, Gradually)

A

Decreases Sharply

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20
Q

Design Disciplines _____ ______ over the system maturity period. (Increase/Decrease, Sharply, Gradually)

A

Increase Gradually

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21
Q

Systems Engineering _____ ______ over the system maturity period. (Increase/Decrease, Sharply, Gradually)

A

Decreases Gradually

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22
Q

True or False: requirements will not change due to understanding of difficulties.

A

False

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23
Q

True or False: reqs change when priorities change.

A

True

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24
Q

Name some places where requirements are derived:

A 
Stakeholder disclosures
Goals/Objectives
Constraints/Assumptions
ConOPs
FOMs
PBS
WBS
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25
System boundaries are _______ ______-
External interfaces
26
List the methods for decomposing requirements:
1. Flow-down 2. Allocation 3. Derivation
27
Define Requirement Decomposition Method: Flow-Down
Direct transfer from subsystem capabilities. | Example: power supply req of sat. system may be entirely flowed down to req of satellite's solar power subsystem.
28
Define Requirement Decomposition Method: Allocation
Quantitative apportionment of resources from higher to lower levels using the same unit of measure. Example: 1000 kg spacecraft may allocate 200 kg, 500 kg, and 300 kg to its three respective subsystems.
29
Define Requirement Decomposition Method: Derivation
Apportionment that is implementation specific. Examples: 1. Launch vehicle propulsion will determine maximum payload mass. 2. Structural stiffness requirement (young's mod) may be determined from natural frequency of launch vehicle.
30
Once requirements are decomposed for all levels of the system, ____ is established to connect them.
Traceablility
31
____ is used to analyse the impact of requirement/mission changes.
Traceability
32
If the parent requirements are incomplete, incorrect, ambiguous, conflicting, or unverifiable, the children requirements will be ______ _______.
Progressively worse
33
Define IDD:
Interface Definition Document: defines interfaces to existing systems
34
Define IRD:
Interface Requirement Document: defines interfaces for two developing systems.
35
What is an ICD?
Interface Control Document: Identifies the design solution for the physical interface (mechanical solutions & drawings)
36
When a system is decomposed into smaller segments, _____ are created.
Interfaces
37
Define a TBD Requirement:
To be decided req
38
Define a TBR Requirement:
To be resolved req
39
Good requirements are _ _ _ _ _
SMART
40
SMART
``` S - Specific M - Measurable A - Achievable R - Relevant T - Traceable ```
41
Name three mandatory characteristics of good requirements:
1. Needed 2. Verifiable 3. Attainable
42
True or False: requirements can address more than one thing.
False
43
True or False: a specific requirement should only be understood in one particular way.
True
44
State a good requirement format: (three words)
WHO SHALL WHAT
45
These words are ________: flexible, lightweight, maximize, adequate, small, portable, easily
Unverifiable
46
These words are ________: as appropriate, so on, but not limited to
Ambiguous
47
True or False: A requirement addresses HOW to provide something.
False
48
Why ask if a requirement is necessary?
To determine if we even need it.
49
True or false, this is a good requirement: the lunar lander shall include an airlock.
False: | The lunar lander shall provide the capability to egress/ingress while maintaining pressure.
50
True or false, this is a good requirement: The spacecraft shall have a lifetime of al least five years.
True
51
True or false, this is a good requirement: The vehicle shall be safe in a minor crash.
False: | The vehicle shall meet all the safety requirements specified in the Safety Codes...
52
True or false, this is a good requirement: The vehicle shall allow extra-vehicular activities during operations phase.
True
53
Checklist for Requirements:
1. Unambiguous? 2. Free of unverifiable shit? 3. Not implementation specific? 4. Necessary? 5. Free of operation description? 6. Free of TBDs?
54
True or False: A requirement can contain an operation description.
False Ask: 'Does the developer have control over this?' 'is this a need the product must satisfy or an activity involving the product?'
55
____ captures the motivation and assumptions of a requirement.
Rationale
56
Rationale or Requirement? | The UAV Shall be able to hover
Requirement
57
Rationale or Requirement? | over 99% of all US highway overpasses have a 14 foot clearance.
Rationale
58
The ______, is the set of techniques preliminarily proposed to test system requirements.
Requirement Verification Plan
59
True or False: When there are many operational scenarios, it is a good idea to choose the worst case scenario for your requirement verification plan.
True: See DRM (ConOps and Scoping) Design Reference Mission
60
What three things does requirement VALIDATION address?
1. If we have the correct problem definition 2. Do our requirement accurately capture this problem 3. Are our requirements SMART or stupid?
61
Define SRR:
System Requirements Review
62
True or False: Requirement validation takes place after the SRR (System Requirements Review)
False, it takes place before the SRR
63
______ ______ is a process of ensuring that: the set of requirements is correct complete and consistent.
Requirement Validation
64
True or False: The cost of reconciling undefined/corrupted requirements stays more or less constant as the project matures.
False. The cost increases dramatically.

AE 424 Final (21 decks)

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