ACRUMEN Slides for DevConf Poland

@davearonsonwww.Codosaur.us
Write Better Software with
ACRUMEN(The Six Key Aspects of Software Quality)
by Dave Aronson
Slides at: bit.ly/acrumen-devconf-pl-slides

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 . . .
(but . . .)

zrobię to po angielsku.
(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 high level . . .

. . . from many points of view.
+

Acrumen: Latin for sour fruit

ACRUMEN: Prioritized acronym of aspects

: does the right job (do what’s needed)
: does the job right (do it correctly)
: hard to make it misbehave
: easy to use (for users)
: easy to change (for devs)
: efficiently uses resources
Software should be:
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

How to Use ACRUMEN

Appropriate: do the right job

Appropriate > ALL the rest
A
CRUMEN

The Importance of Being Appropriate
≠

Achieving Appropriate: Requirements Analysts?

Achieving Appropriate: Talk to stakeholders!

Achieving Appropriate: Mockups, Prototypes, Demos

Achieving Appropriate: Propose Tests!

Correct: do the job right

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

Achieving Correct: Property and Mutation Testing

Robust: hard to make it “misbehave”

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: easy to use

Defining Usable: Clear what/how

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

There’s more!

Defining Usable: Easy Despite Challenges

Usable: External Factors

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!

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: makes efficient use of resources

Achieving Efficient: Measure!

Achieving Efficient: Find the Cause

Achieving Efficient: Algorithms and Data Structures

Achieving Efficient: Performance Test

Achieving Efficient: Multitasking / Parallelism / Concurrency

Multitasking Example: Generating a PDF

What inspired ACRUMEN?

Why is this knight different from all other knights?

Search for a Definition

DIY

BOTA (Bring On The Acronyms)!
ACRUME?
U-SCREAM, CARE-SUM, etc.
ACRSUME / ACSRUME?!
ACRUMEN!

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
Balance Scale: https://pixabay.com/en/balance-scale-justice-law-judge-154516/
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
Cat/Bird: https://pixabay.com/en/genetic-modification-mutant-mutation-549889/
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
Crowded Bus: https://pxhere.com/en/photo/655281
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/
Developer: https://pixabay.com/en/coding-computer-computer-user-pc-1294361/
Dice: https://pxhere.com/en/photo/615255
Diogenes Poster: https://commons.wikimedia.org/wiki/File:%22WE%27RE_LOOKING_FOR_SUGGESTIONS._WRITE_ONE_TODAY%22_-_NARA_-_516108.jpg
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
George Falcon: his Facebook profile
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/
Inspiration: https://commons.wikimedia.org/wiki/File:William-Adolphe_Bouguereau_(1825-1905)_-_Inspiration_(1898).jpg
International Space Station: https://www.flickr.com/photos/nasacommons/8980505397
Jean-Luc Picard: https://www.flickr.com/photos/enerva/8496943140
Knight: https://pixabay.com/en/crusader-armour-fighter-knight-154623
Knight Cat Face: https://pixabay.com/en/cat-drawing-hand-drawn-cute-design-2573708/
Knight Wolf Face: https://pixabay.com/en/animal-wolf-nature-wild-wildlife-986052/
Knitting: https://pxhere.com/en/photo/1190813
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/
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/
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/
Private Property Sign: https://www.flickr.com/photos/athomeinscottsdale/3279949186
Quality Excellence Package: https://pixabay.com/en/software-packaging-quality-500956/
Report: https://www.flickr.com/photos/wufoo/4055862405
Rosie the Riveter: https://commons.wikimedia.org/wiki/File:We_Can_Do_It!.jpg
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/
Snail: https://pixabay.com/en/snail-animal-fun-surprised-160313/
Test Pattern: https://en.wikipedia.org/wiki/File:Telefunken_FuBK_test_pattern.svg
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
Train Tracks: https://pixabay.com/en/train-gleise-traces-parallel-3415515/
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)!
?

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