This presentation is part of "Continuous change" (the practice to continuosly change the way of working according to the continuous change of the products needs) This presentation is focused on the description of 2 complexity indicators: the user stories estimation precision and the type of the test that the team can plan|realize

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Continuous change
Complexity indicators:
estimation precision and test types

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Software craftsman
Trainer and coach for agile software development
roberto.bettazzoni@agile42.com
linkedin.com/in/robertobettazzoni
@bettazzoni
Roberto Bettazzoni

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Continuous change

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Why should I change my way of working?
To build modern products in more effective way

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Why should I change my way of working?
To build complex products in more effective way

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Product complexity ?
• Internal
• Technical
• Unknown
• Cultural
Sources of complexity

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Product complexity
Internal
Technology
Unknown
Cultural
Start EndProduct development

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Cynefin framework is a trademark of Cognitive Edge - Kudos to David Snowden
Complicated
sense
analyse
respond
Obvious
sense
categorise
respond
Chaotic
act
sense
respond
Complex
probe
sense
respond
"Cynefin as of 1st June 2014" by Snowded - Own work. Licensed under CC BY-SA 3.0 via Commons -
https://commons.wikimedia.org/wiki/File:Cynefin_as_of_1st_June_2014.png#/media/File:Cynefin_as_of_1st_June_2014.png
Disorder

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Complicated
ObviousChaotic
Complex
v

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Scrum
XP
Complicated
ObviousChaotic
Complex
v

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ObviousComplex Complicated
Scrum
XP

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How can I measure the complexity?
You need indicators

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ObviousComplex Complicated
Statistics
Indicators Measures
Standard
Measure
Precise
Leading
Lagging

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ObviousComplex Complicated
0%
50%
100%
Planning Estimation precision
Good estimationsEstimations with errorsHigh error
Complexity indicators

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ObviousComplex Complicated
cp src/*.c build/
No need for tests
#include "mainwindow.h"
#include "ui_mainwindow.h"
#include "alarm.h"
#include <QTimer>
#include <QtMultimedia>
MainWindow::MainWindow(QWidget *parent) : QMainWindow(parent),
ui(new Ui::MainWindow){
ui->setupUi(this);
ui->progressBar->setTextVisible(true);
ui->LcdNumber->display("00:00");
timer = new QTimer(this);
connect(timer, SIGNAL(timeout()), this, SLOT(updateTime()));
alarm = new Alarm(0);
}
MainWindow::~MainWindow(){
delete ui;
delete timer;
delete alarm;
}
void MainWindow::showOnScreen(int elapsed, int remaning){
int m = remaning/60;
int s = remaning % 60;
char buf[32];
sprintf(buf, ((s % 2 == 0)? "%02d:%02d": "%02d %02d"),m,s );
ui->LcdNumber->display(buf);
ui->progressBar->setValue(elapsed);
}
void MainWindow::updateTime(){
alarm->updateTime();
if (alarm->expired) {
timer->stop();
playSound();
ui->LcdNumber->display("00:00");
} else {
showOnScreen(alarm->elapsed_seconds, alarm->remaining_seconds);
}
}
void MainWindow::on_startButton_clicked(){
int m = ui->minSpinBox->value();
int s = ui->secSpinBox->value();
int totsec = m * 60 + s;
if (totsec > 0) {
ui->progressBar->setMaximum(totsec);
alarm->setExpireTime(totsec);
showOnScreen(alarm->elapsed_seconds, alarm->remaining_seconds);
timer->start(500);
}
}
void MainWindow::on_pauseContinueButton_clicked(){
timer->stop();
}
void MainWindow::playSound(){
QSound::play("/Users/taz/al/MacTimer/MacTimer/ezekiel.wav");
}
Exact testsStatistical/Complex tests
#include <QtTest/QtTest>
class TestQString: public QObject{
Q_OBJECT
private slots:
void toUpper();
};
void TestQString::toUpper(){
QString str = "Hello";
QCOMPARE(str.toUpper(), QString("HELLO"));
}
QTEST_MAIN(TestQString)
#include "testqstring.moc"
Micro tests
Complexity indicators
Test types

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Product complexity indicators
Estimation
precision
Test type
Scrum
meeting
duration
Capacity allocation
# spikes
# features rejected
Tech expert time

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How can I change my way of working?
You need appropriate methods

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ObviousComplex Complicated
Scrum
XP
Safe to fail
experiments

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Roberto Bettazzoni
@bettazzoni
Q&A