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Teknisk gjeld er ikke teknisk
Einar W. Høst
@einarwh
Normal
Normal
Hva er teknisk gjeld?
Normal
Normal
Teknisk gjeld som meme.
Normal
Normal
Normal
Normal
Meme som selv-kopierende tankeenhet.
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Normal
Hva får et meme til å spre seg?
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Normal
Survival of the fittest?
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Normal
Størst forklaringskraft?
Normal
Normal
Reduserer kognitiv dissonans?
Normal
Normal
De beste ideene
vs
De ideene som får oss til å føle oss best
Normal
Normal
Hva er teknisk gjeld?
Normal
Normal
Teknisk gjeld som metafor.
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Normal
Shipping first time code is like going into
debt. A little debt speeds development so
long as it is paid back promptly with a
rewrite... The danger occurs when the debt
is not repaid. Every minute spent on not-
quite-right code counts as interest on that
debt. Entire engineering organizations can
be brought to a stand-still under the debt
load of an unconsolidated implementation,
object-oriented or otherwise.
Normal
Normal
Hva er bra med teknisk gjeld som metafor?
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Gir oss språk til å snakke om noe viktig!
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Setter kvalitet på agendaen!
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Normal
Gjør det usynlige synlig!
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Takk Ward Cunningham!
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Hva er problematisk med
teknisk gjeld som metafor?
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Normal
Vanlig “pengegjeld” er kvantifisert.
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Normal
Hvor målbart er det vi kaller teknisk gjeld?
Normal
Normal
(Hvor mye teknisk gjeld har vi?)
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(Er vi teknisk solvente??)
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Normal
(Når er vi teknisk konkurs???)
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Hva er egentlig teknisk gjeld?
Normal
Normal
Hvordan ser teknisk gjeld ut?
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Stygg kode?
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Hva forårsaker teknisk gjeld?
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Hvorfor blir koden stygg?
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Dårlig tid?
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“Prosjektlederen min forstår meg ikke?”
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Normal
“Konseptutviklerne er urealistiske?”
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Normal
“Den forrige utvikleren var dum?”
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Normal
Hvordan ser teknisk gjeld ut?
Normal
Normal
Svake abstraksjoner.
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Normal
Haugevis av flagg og forgreninger.
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Normal
Vanskelig å se hvor ting starter og slutter.
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Normal
Vanskelig å se konsekvensene av endring.
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Normal
Episykler på episykler.
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Normal
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Hva er dette symptomer på?
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Normal
At prosjektleder/produkteier/kunde
ikke skjønner seg på teknologi?
Normal
Normal
At den forrige utvikleren brukte feil
rammeverk for dependency injection?
Normal
Normal
At vi burde ha konfigurasjon
i JSON istedenfor XML?
Normal
Normal
At vi burde ha konfigurasjon
i kode istedenfor filer?
Normal
Normal
At vi burde praktisere
London-school TDD?
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Normal
At vi burde innføre microservices?
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Normal
Nei.
Normal
Normal
(Det var opplagt.)
Normal
Normal
Men noe har gått fundamentalt galt.
Normal
Normal
Abstraksjonene vi har laget lar oss
ikke uttrykke oss klart og konsist.
Normal
Normal
Modelleringen har sviktet.
Normal
Normal
(Hva er modellering?)
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Normal
Noe har gått galt i prosessen med:
1) å forstå forretningsdomenet,
2) å velge og fatte beslutninger
3) å representere domenet i
programvare på en
hensiktsmessig måte.
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Normal
Teknisk gjeld skyldes modelleringsgjeld.
Normal
Normal
“Knowledge crunching”
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Normal
“You're wise to make the software reflect
your understanding as best you can.”
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Hvordan kan vi nedbetale teknisk gjeld?
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Normal
(Alle i kor nå)
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Refaktorering!
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Normal
Hvilken refaktorering fikser
en sammenfiltret ball av
svake abstraksjoner?
Normal
Normal
A rewrite will end up with the same
problems as the original unless you
close the understanding gap.
— @sarahmei
Normal
Normal
Ingen refaktorering uten remodellering!
Normal
Normal
Alt annet er utvikler-hovmod!
Normal
Normal
“Software
craftsman
to the
rescue”
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Normal
Såkalte best practices er ikke nok!
Normal
Normal
Clean code kan ikke fikse en råtten modell!
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Normal
“refactoring to deeper insight”
Normal
Normal
Fiks modellen først, koden etterpå.
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Er vi ferdige nå?
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Normal
…
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Normal
Hvordan fikser vi modellen?
Normal
Normal
Hva forårsaker modelleringsgjeld?
Normal
Normal
(OMG here we go again!)
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Normal
Mangelfull kommunikasjon!
Normal
Normal
Manglende beslutninger!
Normal
Normal
Mangelfullt samarbeid!
Normal
Normal
Primært et menneske-problem!
Normal
Normal
Hvorfor snakker vi likevel om teknisk gjeld?
Normal
Normal
Konsekvensene viser seg på teknisk nivå.
Normal
Normal
Utviklere leter etter tekniske
løsninger på myke problemer.
Normal
Normal
Tekniske oppgaver er fristende!
Normal
Normal
Involverer lite psykologi.
Normal
Normal
Fører sjelden til konflikt.
Normal
Normal
Teknisk arbeid er puzzle solving .
Normal
Normal
Modelleringsarbeid avdekker motsetninger.
Normal
Normal
Hva får et meme til å spre seg?
Normal
Normal
Størst forklaringskraft?
Normal
Normal
Reduserer kognitiv dissonans?
Normal
Normal
Det finnes ikke
tekniske løsninger på teknisk gjeld
Normal
Normal
Teknisk gjeld er ikke teknisk
Normal
Normal
Fiks motsetningene først, koden etterpå.
Normal
Normal
https://einarwh.wordpress.com/2015
/12/05/technical-debt-isnt-technical/
http://dotnetrocks.com/?show=1235

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Teknisk gjeld er ikke teknisk

Editor's Notes

  1. I work at NRK. We take quality pretty seriously, because people notice when we fail. This means that PRAGMATISM is a luxury and a comfort we can’t afford. I’ll tell you why.
  2. To understand why, let’s look at a definition of pragmatism.