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Metriche Kanban in pratica a Sky UK [ITA]

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Perche’ dovrei raccogliere metriche? Come possono aiutarmi? Il mio CFD e’ molto colorato ma a cosa serve?

CFD, control chart, lead time distribution…Le metriche possono incutere timore ma se sai come interpretarle puoi portare il tuo processo a un nuovo livello!

In questo experience report pieno di esempi pratici vi raccontero’ come il mio team a Sky (Londra) usa Kanban e metriche per:
- guidare il processo di miglioramento continuo
- essere prevedibili, senza bisogno di stime

Downloads
Powerpoint: https://goo.gl/mHg3nx
PDF: https://goo.gl/WFaoW8

Publicado en: Software
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Metriche Kanban in pratica a Sky UK [ITA]

  1. 1. Metriche Kanban in pratica @ Sky UK GOOD CRAP AWESOME! @BattistonMattia
  2. 2. About me ● ~2 anni @ Sky Network Services, Londra ● software dev & continuous improvement ● Kanban “helper” Mattia Battiston @BattistonMattia mattia.battiston@gmail.com Ciao!
  3. 3. Perché siamo qui? ESPERIENZA PERCHÉ COME MIGLIORAMENTO LEZIONI IMPARATE FORECASTING
  4. 4. Kan...ché? conoscenza di base di Kanban aiuta (WIP limits, lead time, batches, etc.)
  5. 5. Metriche - Perché? #1: miglioramento continuo #2: prevedere il futuro
  6. 6. Ma le metriche non erano cattive? Problemi tipici: - si imbroglia - disfunzioni
  7. 7. Buone vs Cattive Metriche ● migliorare il sistema ● premiare/punire individui “95% performance attribuibile al sistema, 5% alle persone” W. Edwards Deming ● feedback ● obiettivi ● leading (guardano al presente) ● lagging (guardano al passato) ● tutte devono migliorare ● ottimizzazioni locali
  8. 8. Il nostro sistema Iteration-Based On-demand Direct
  9. 9. Come raccogliamo i dati?
  10. 10. Spreadsheet Input: dettagli della storia; inizio & durata di ogni stato;
  11. 11. (Poca) Matematica ● Min, Max Normal: data is distributed around a central value e.g. height of UK population Skewed: data has a long tail on one side (positive or negative) e.g. income of UK population (positive skew) Lead time of stories follows skewed distribution ● Media avg(1,2,2,2,3,14) = (1+2+2+2+3+14)/6 = 4 ● Mediana: separa metà alta e metà bassa. Meno influenzata da outlier median(1,2,2,2,3,14) = 2 ● Moda: valore più frequente mode(1,2,2,2,3,14) = 2 ● Standard Deviation: misura la dispersione dalla media. Quando è alta, i valori oscillano in un largo intervallo. stdev(1,2,2,2,3,14) = 4.5; stdev(1,2,2,2,3,5) = 1.2; ● Percentile: percentuale di elementi che cadono in un intervallo 50% perc(1,2,2,3,7,8,14) = 3; 80% perc(1,2,2,3,7,8,14) = 7.8; ● Normal Distribution vs Skewed Distribution:
  12. 12. Cumulative Flow Diagram Descrizione: Per ogni giorno mostra quante storie sono in ogni stato no.storie giorni
  13. 13. Cumulative Flow Diagram ● Obiettivo: retrospettiva (con un buon facilitatore) ● Obiettivo: dimostra l’efficacia dei cambiamenti cambio WIP limit in DEV: da 3 a 2
  14. 14. Cumulative Flow Diagram ● Obiettivo: decidere su cosa lavorare oggi ● Obiettivo: forecasting. Approssimazione per lead time, wip, delivery date (ma è più facile se sono raccolti separatamente) WIP LEAD TIME
  15. 15. CFD Patterns (fonte: CFD article by Pawel Brodzinski) growing lines: indicate large WIP + context switching. action: use WIP limits stairs: indicates large batches and timeboxes action: move towards flow (lower WIP, more releases, cross-functional people) flat lines: nothing’s moving on the board action: investigate blockers, focus on finishing, split in smaller stories single flat line: testing bottleneck action: investigate blockers, pair with testers, automate more typical timeboxed iterationdropping lines: items going back action: improve policies
  16. 16. metriche per Delivery Time
  17. 17. Control Chart Descrizione: Mostra la durata di ogni storia. Usa un limite superiore e inferiore; le storie che cadono fuori dai limiti sono storie interessanti (insolite), le analizziamo per migliorare storie cycletime(gg)
  18. 18. Cycle/Lead Time stats + History Descrizione: Statistiche per conoscere il tuo cycle time. Aiuta a predire “quanto impiegherà probabilmente la prossima storia?”. Visualizza trend di miglioramento
  19. 19. Lead Time distribution 50% 85% cycle time (gg) no.storie Descrizione: Per ogni lead time (n. giorni), quante storie hanno impiegato così a lungo. Utile mostrarlo in percentuale per conoscere la probabilità.
  20. 20. Story Health 50-80% >90%80-90%0-50% Descrizione: Indica se una storia è in buona salute o se dobbiamo preoccuparci. Basato su lead time distribution 0-6gg 6-10gg 10-14gg 14+gg
  21. 21. Cycle Time vs Release Prep. Time storie giorni Descrizione: Per ogni storia mostra quanto ha speso nell’iterazione e in release preparation. Usato per discutere il costo di rilasci poco frequenti
  22. 22. metriche per Prevedibilità
  23. 23. Iteration Throughput iterazione no.storiecompletate Descrizione: Numero di storie completate in una iterazione
  24. 24. WIP iterazione media(WIPgiornaliero) Descrizione: Per ogni iterazione, la media del WIP giornaliero
  25. 25. Little’s Law more visible here Descrizione: Lead Time = WIP / Throughput Dimostra che quando WIP scende, il Lead Time diminuisce e il Throughput cresce
  26. 26. Points vs Cycle Time cycletime(gg) story points Descrizione: Mostra scarsa correlazione tra punti stimati e cycle time reale
  27. 27. Disney Stations Descrizione: Come in coda a Disneyland. “Quanto tempo qui? Quanto tempo da qui?”
  28. 28. Task Time Descrizione: Mostra quanto impiega ogni task. Dà indicazione di quanto una storia impiegherà in base al n. di task
  29. 29. metriche per Qualità
  30. 30. Bugs percentage Descrizione: Percentuale di bug per storia. Espresso come “1 bug ogni X storie”
  31. 31. metriche per Miglioramento Continuo
  32. 32. Flow Efficiency Descrizione: Mostra quanto tempo le storie spendono in code - nessuno ci stava lavorando. Mostra quanto si può migliorare eliminando i tempi di attesa.
  33. 33. Time in status tempoinstato(gg) storie Descrizione: Per ogni storia mostra quanto ha speso in ogni stato (tempo assoluto e percentuale). Mostra trend di dove le storie spendono più tempo tempoinstato(%)
  34. 34. Stats per Status Descrizione: control chart, cycle time distribution e stats per ogni stato. Utile per simulazioni (forecast); dà indicazione di dove dobbiamo migliorare
  35. 35. Retrospettiva
  36. 36. Risorse Libri Presentazioni ● Troy Magennis LKUK13 LKCE13 Agile 2014 ● David Anderson Kanban's 3 Agendas LKUK13 ● Hakan Forss The Red Brick Cancer Articoli ● Cycle-time Analysis and Monte Carlo Simulation Results (Troy Magennis) ● The Seven Deadly Sins of Agile Measurement (Larry Maccherone) ● A Tool for tracking Kanban projects (Emily Webber) ● FocusedObjective@Github ● Lean Forecasting Tutorial by Troy Magennis ● Cumulative Flow Diagram (Pawel Brodzinski) ● worldofchris@github (Chris Young) Case Studies Siemens Health Services Sandvik IT Ericsson SAP Lean Kanban Case Studies series ● Dan Brown Flow Like Ketchup (LLKD14) ● Dimitar Bakardzhiev LKUK14 webinar ● Larry Maccherone LKUK14 ● Analyzing Lead Time Distribution Chart (Alexei Zheglov) ● Inside a Lead Time Distribution (Alexei Zheglov) ● Forecasting Your Oranges (Dan Brown) ● On Story Points and Distributions (Agile Pirate)
  37. 37. Grazie! @BattistonMattia mattia.battiston@gmail.com molto, molto apprezzato! Aiutami a migliorare

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