ACRUMEN Slides for Arlington Ruby (Practice for DevConf)

@davearonsonwww.Codosaur.us
ACRUMEN:
The Six Key Aspects
of Software Quality
by Dave Aronson
Slides at: bit.ly/acrumen-slides-arlington-ruby

Dzień dobry, Kraków!
(Good morning, Krakow!)

Jestem Dave Aronson,
(I am Dave Aronson,)

i przyjechałem
opowiedzieć wam o
(and I came to tell you about)

ACRUMEN

ale, zrobię to po angielsku.
(but, I will do it in English.)

Experienced Developer

T. Rex of Codosaurus, LLC

Member of Toptal (but not speaking on their behalf)
https://www.toptal.com/#accept-only-candid-coders

Do you like low quality software?

Have you written any?

We need more software quality!

What is software quality?!

Previous attempts to define software quality:

So zoom out . . .

. . . to six aspects . . .

. . . with simple names and explanations . . .

. . . from many points of view.
+

Acrumen: Latin for sour fruit

ACRUMEN: Prioritized acronym of aspects

Software should be:
does the right job
does the job right
hard to make misbehave
easy (for users) to use
easy (for devs) to change
efficiently uses resources
Appropriate
Correct
Robust
Usable
Maintainable
Efficient
:
:
:
:
:
:

N stands for… Nothing! Just makes a word.

Aspekty po Polsku — oprogramowanie powinno być:
Właściwe : wykonuje właściwą pracę
Poprawne : prawidłowo wykonuje zadanie
Odporne : trudno wymusić błędne zachowanie
Praktyczne : łatwe w użyciu
Utrzymywalne : łatwe do zmiany
Wydajne : skutecznie wykorzystuje zasoby

The Importance of Being Appropriate
≠

Achieving Appropriate: Requirements Analysts?

Achieving Appropriate: Talk to stakeholders!

Achieving Appropriate: Mockups, Prototypes, Demos

Achieving Appropriate: Propose Tests!

Correct

How do we know it’s Correct?

Achieving Correct: Proven by Tests!

Achieving Correct: Automated tests

Achieving Correct: Start with “appropriate” tests (high-level)

Achieving Correct: Low-level tests too

Robust

Defining Robust: Upholding the CIA Triad
Confidentiality
Availability
Integrity

Confidentiality: Don’t Reveal Info (w/o authorization)

Integrity: Don’t Alter Info (w/o authorization)

Availability: Don’t Be Unavailable (w/o authorization)

Defining Robust: Uphold CIA Triad even under attack

Achieving Robust: Penetration Testers?

Pen-Test Tools: Static Analyzers

Pen-Test Tools: Fuzzers

Pen-Test Tools: Probes

Achieving Robust: What could go wrong?

Achieving Robust: Pick a file, any file…

Achieving Robust: Think Like an Attacker

Achieving Robust: Handle Likely Problems

Usable

Defining Usable: Clear what/how

Defining Usable: What Else Can It Do?
But wait!

There’s more!

Defining Usable: Easy Despite Challenges

ALL software should be usable!
GET /index.html HTTP/1.1
HOST www.example.com
HTTP/1.1 200 OK
<html><body>Hello, world!</body></html>

Achieving Usable: Usability User Interface Experts?

Achieving Usable: Guidelines, Standards, and Regulations

Achieving Usable: Use It Ourselves

Achieving Usable: Testing!

Defining Maintainable: Easy to Change

Defining Maintainable: …with low chance of error…

Defining Maintainable: …and low fear of error…

Defining Maintainable: …even for a novice…

Defining Maintainable: …new to the project.

Achieving Maintainable: Good Names

Achieving Maintainable: Single Responsibility

Achieving Maintainable: Tests!

Efficient Use of Resources

Achieving Efficient: Measure!

Achieving Efficient: Algorithms and Data Structures

Achieving Efficient: Performance Test

Achieving Efficient: Multitasking

Multitasking Example: Generating a PDF

If our software is

Appropriate,

Correct,

Robust,

Usable,

Maintainable, and

Efficient, then

Nobody should be sour about it!
Conclusion

Just to keep legal, image credits: all mine, public domain,

used with permission, or usable with credit
Alterations: http://www.barksdale.af.mil/News/Article/321176/military-clothing-sales-reopens-inside-base-exchange/
ATM: http://www.publicdomainpictures.net/view-image.php?image=25030
Billy Mays: https://commons.wikimedia.org/wiki/File:Billy_Mays_headshot.jpg
Boards High Up: https://pixabay.com/en/boards-height-balance-2040575/
Business Silhouettes: http://www.publicdomainpictures.net/view-image.php?image=57465
Calipers: https://pixabay.com/en/diet-calorie-counter-weight-loss-695723/
Call Stack: https://commons.wikimedia.org/wiki/File:ProgramCallStack2_en.png
Cassini Space Probe: https://photojournal.jpl.nasa.gov/catalog/PIA03883
Checkers: https://commons.wikimedia.org/wiki/File:Draughts.svg
Checklist on clipboard: https://pixabay.com/en/checklist-clip-board-blank-to-do-310092/
Checklist w/o clipboard: https://pixabay.com/en/checklist-list-check-check-list-911840/
Chess: https://bs.wikipedia.org/wiki/Datoteka:AAA_SVG_Chessboard_and_chess_pieces_03.svg
Clear Night Sky: https://pixabay.com/en/british-columbia-canada-clear-lake-2382640/
Codosaurus Rate Calculator: screenshot taken by me, of my own app
Corrected Paper: https://commons.wikimedia.org/wiki/File:Correct.svg
Darth Vader: https://pixabay.com/en/star-wars-darth-wader-villain-2463926/
Data Structure: https://commons.wikimedia.org/wiki/File:A_diagram_of_the_Aho-Corasick_string_search_algorithm_extracted.png
Desktop App: https://pixabay.com/en/presentation-slide-animation-title-1794128/
Dice: https://pxhere.com/en/photo/615255
Dog Eating: http://www.usafe.af.mil/News/Article-Display/Article/748008/mwds-cared-for-at-home-station-in-the-field/
Dog at keyboard: https://www.publicdomainpictures.net/en/view-image.php?image=174322
Easy Button: https://www.flickr.com/photos/slgc/24803618672
Easy Cheese: https://www.flickr.com/photos/jeepersmedia/13943817487
Error X: https://commons.wikimedia.org/wiki/File:Dialog-error-round.svg
Experts (tho Road Safety, not Requirements): http://archive.government.ru/eng/multimedia/photo/2013/3/#PhotoSwipe1528053974200
Experts (tho NASA, not UX): https://roundupreads.jsc.nasa.gov/pages.ashx/699/10%20things%20to%20know%20and%20share%20about%20the%20Eclipse%20Across%20America
Eye Tester: https://commons.wikimedia.org/wiki/File:Test_type_to_test_eyesight,_England,_1920-1960_Wellcome_L0058205.jpg
F-35 Flight Test: http://www.hill.af.mil/News/Article-Display/Article/838188/commentary-diamond-in-the-rough-commander-shares-514th-flts-mission/
F-35 Landing Test: http://www.eglin.af.mil/News/Article/814410/marines-fly-first-f-35-stovl-mission-at-eglin/
Feedback Circuit: mine (other than the “?” and the color, this was the TIDMADT logo.)
File Icon: extracted from https://pixabay.com/en/folder-icon-file-business-sign-2013220/
Fuzzy Green Slippers: https://www.flickr.com/photos/jamiesrabbits/4131046128
Girl with Staticy Hair: extracted from https://pixabay.com/en/girl-child-trampoline-blonde-212022 (CC0)
Glucose Test: https://pxhere.com/en/photo/726931
Handle: https://pixabay.com/en/handle-door-handle-doorknob-lock-1200809/
International Space Station: https://www.flickr.com/photos/nasacommons/8980505397
Lemonade: https://pixabay.com/en/lemonade-lemons-glass-beverage-1447521/
Lemonhead: https://www.maxpixel.net/Face-Fruit-Citrus-Fruit-Angry-Sour-Citron-Lemon-155021
Long List: https://pxhere.com/en/photo/941467
Low Quality: https://pixabay.com/en/bad-review-bad-customer-review-2813741/
Man in Matrix: https://pixabay.com/en/man-despair-problem-null-one-65049/
Mobile App: https://pixabay.com/en/whatsapp-smartphone-mobile-phone-3126713/
Name Tags: https://commons.wikimedia.org/wiki/File:NFX_Guild_conference_name_tags.jpg
New Guy: https://commons.wikimedia.org/wiki/File:New_Guy_(5895483627).jpg
Novice: https://pxhere.com/en/photo/796734
One Job: https://bloodredstrider.deviantart.com/art/Fortune-Cookie-Fail-394495312
Ordered List: https://pixabay.com/en/steps-list-ordered-list-items-1496523/
Parallel Lines: https://pixabay.com/en/train-gleise-traces-parallel-3415515/
Penetrating Pen: https://commons.wikimedia.org/wiki/File:Javad_alizadeh_-penetrating-pen.jpg
Plan A/B/C: https://pixabay.com/get/ef37b10d21fd1c22d9584518a345479ee277e0d204b014439df0c47ba7eab1/planning-620299_1920.jpg
Potatoes in Pot: https://pixabay.com/en/potatoes-fear-horror-pot-cook-3119211/
Prius: https://www.flickr.com/photos/toyota-europe/6759334043/in/photostream/
Quality Excellence Package: https://pixabay.com/en/software-packaging-quality-500956/
Shuttle Engine Performance Test: https://www.nasa.gov/multimedia/imagegallery/image_feature_457.html
Simple list: https://commons.wikimedia.org/wiki/File:List_icon.svg
Site Unavailable: https://pixabay.com/en/error-www-internet-calculator-101408/
Test Pattern: https://commons.wikimedia.org/wiki/File:RCA_Indian_Head_test_pattern.JPG
The Codosaurus: by Fanie Gregoire, https://www.etsy.com/shop/fanie (used by permission)
Thermos: https://zh.wikipedia.org/wiki/File:Thermoskanne(hoch,_silber).JPG
Ties: https://www.publicdomainpictures.net/en/view-image.php?image=37274
TPS Report: https://www.flickr.com/photos/wufoo/4055862405
Tractor: https://commons.wikimedia.org/wiki/File:Hanomag_Robust_901A_Cloppenburg.jpg
Triangle: https://cdn.pixabay.com/photo/2016/03/31/17/52/geometry-1293961_960_720.png (words mine)
Two Women at Laptop: https://www.flickr.com/photos/wocintechchat/22543243101
Usability Testing: https://www.flickr.com/photos/eekim/1819059803
Unix Command Line: https://en.wikipedia.org/wiki/File:Version_7_Unix_SIMH_PDP11_Emulation_DMR.png
Viking: https://pixabay.com/en/man-viking-barbarian-machado-1706964/
Weeds: extracted from https://commons.wikimedia.org/wiki/File:Indian_Weeds.jpg
Wireframe Mockups: https://www.flickr.com/photos/qubodup/14793417722
Wizard: https://commons.wikimedia.org/wiki/File:Kandalf_wizard_mascot_kde.png
Woman Programming: https://pxhere.com/en/photo/912909
Wondering Monkey: https://www.pexels.com/photo/brown-monkey-photo-767197/
Your Co's App: Eric Burke of StuffThatHappens.com (defunct)

http://www.Codosaur.us
@davearonson (on Twitter)
Questions? Feedback? Training?
Thanks again to Toptal
(https://toptal.com/#accept-only-candid-coders)!
?

ACRUMEN Slides for Arlington Ruby (Practice for DevConf)

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