Software development is riddled with explicit and implicit costs. Every decision you make has a cost attached to it. When you're writing code, you're making an investment, the size of which will for a long time define the costs of your future growth. Making right decision about these investments is very tricky and the cost of wrong decisions might be crippling for both business and teams that support it. Extreme Programming and Test Driven Development in particular are practices that are aiming at supporting development effort by making it easier to introduce change. That said, sometimes those tools can become a problem of its own when applied in the wrong way or for the wrong context. Understanding software cost forces is a very important skill of successful teams and something that helps understand how to apply XP and TDD in different contexts.

1. MIN-MAXING
Software Costs
Konstantin K.
@everzet

2. TECHNICAL
DEBT

3. Without
frameworks
Simple
frameworks
Enterprise
frameworks

4. IS MESS
PART OF
A COURSE?

5. MIN-MAXING
SOFTWARE COSTS

6. SOFTWARE FORCES
• Creation - Introduction of a brand new feature
• Change - Business-driven modification of existing feature
• Ownership - Physical capability to change a feature
• Control - Capability to sustainably change a feature

7. SOFTWARE COSTS
1. Cost of Creation
2. Cost of Change
3. Cost of Control

8. COST OF CREATION

9. Project Lifetime
Beginning 3 months 6 months 9 months ...
Cost of Creation

10. CONVENTIONS
OPTIMISE
FOR CREATION

11. $ bin/rails generate controller welcome index

12. from django.contrib import admin
from . import models
admin.site.register(models.Article)

13. package hello;
import java.util.concurrent.atomic.AtomicLong;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.RestController;
@RestController
public class GreetingController {
...
}

14. CREATION
IS LIMITED BY
THE LIFE SPAN

15. Creation
→
Change
Project Lifetime
Beginning 3 months 6 months 9 months ...
Cost of Creation

16. Creation
→
Change
Project Lifetime
Beginning 3 months 6 months 9 months ...
Cost of Creation
Pure observation &
personal experience

17. Creation
→
Change
Project Lifetime
Beginning 3 months 6 months 9 months ...
Cost of Creation
Conventional Project

18. Creation
→
Change
Project Lifetime
Beginning 3 months 6 months 9 months ...
Cost of Creation
Conventional Project
Conventional Project

19. Convention-based projects either
die a hero or live long enough to
see themselves become the villain.

20. COST OF CHANGE

21. Project Lifetime
Beginning 3 months 6 months 9 months ...
Cost of Creation Cost of Change

22. THE SEARCH
FUNCTION

23. public function searchAction(Request $req)
{
$form = $this->createForm(new SearchQueryType, new SearchQuery);
$normalizedOrderBys = $this->getNormalizedOrderBys($filteredOrderBys);
$this->computeSearchQuery($req, $filteredOrderBys);
if ($req->query->has('search_query')) {
/** @var $solarium Solarium_Client */
$solarium = $this->get('solarium.client');
$select = $solarium->createSelect();
// configure dismax
$dismax = $select->getDisMax();
$dismax->setQueryFields(array('name^4', 'description', 'tags', 'text', 'text_ngram', 'name_split^2'));
if ($req->query->has('search_query')) {
$form->bind($req);
if ($form->isValid()) {
$escapedQuery = $select->getHelper()->escapeTerm($form->getData()->getQuery());
$escapedQuery = preg_replace('/(^| )-(S)/', '$1-$2', $escapedQuery);
$escapedQuery = preg_replace('/(^| )+(S)/', '$1+$2', $escapedQuery);
if ((substr_count($escapedQuery, '"') % 2) == 0) {
$escapedQuery = str_replace('"', '"', $escapedQuery);
}
$select->setQuery($escapedQuery);
}
}
} elseif ($req->getRequestFormat() === 'json') {
return JsonResponse::create(array(
'error' => 'Missing search query, example: ?q=example'
), 400)->setCallback($req->query->get('callback'));
}
return $this->render('SomeAppWebBundle:Web:search.html.twig');
}

24. public function searchAction(Request $req)
{
$form = $this->createForm(new SearchQueryType, new SearchQuery);
$normalizedOrderBys = $this->getNormalizedOrderBys($filteredOrderBys);
$this->computeSearchQuery($req, $filteredOrderBys);
if ($req->query->has('search_query')) {
/** @var $solarium Solarium_Client */
$solarium = $this->get('solarium.client');
$select = $solarium->createSelect();
// configure dismax
$dismax = $select->getDisMax();
$dismax->setQueryFields(array('name^4', 'description', 'tags', 'text', 'text_ngram', 'name_split^2'));
if ($req->query->has('search_query')) {
$form->bind($req);
if ($form->isValid()) {
$escapedQuery = $select->getHelper()->escapeTerm($form->getData()->getQuery());
$escapedQuery = preg_replace('/(^| )-(S)/', '$1-$2', $escapedQuery);
$escapedQuery = preg_replace('/(^| )+(S)/', '$1+$2', $escapedQuery);
if ((substr_count($escapedQuery, '"') % 2) == 0) {
$escapedQuery = str_replace('"', '"', $escapedQuery);
}
$select->setQuery($escapedQuery);
}
}
} elseif ($req->getRequestFormat() === 'json') {
return JsonResponse::create(array(
'error' => 'Missing search query, example: ?q=example'
), 400)->setCallback($req->query->get('callback'));
}
return $this->render('SomeAppWebBundle:Web:search.html.twig');
}

25. HOW LONG WOULD
IT TAKETO ADD TAGS
SUPPORT?

26. public function searchAction(Request $req)
{
$form = $this->createForm(new SearchQueryType, new SearchQuery);
$normalizedOrderBys = $this->getNormalizedOrderBys($filteredOrderBys);
$this->computeSearchQuery($req, $filteredOrderBys);
if ($req->query->has('search_query')) {
/** @var $solarium Solarium_Client */
$solarium = $this->get('solarium.client');
$select = $solarium->createSelect();
// configure dismax
$dismax = $select->getDisMax();
$dismax->setQueryFields(array('name^4', 'description', 'tags', 'text', 'text_ngram', 'name_split^2'));
if ($req->query->has('search_query')) {
$form->bind($req);
if ($form->isValid()) {
$escapedQuery = $select->getHelper()->escapeTerm($form->getData()->getQuery());
$escapedQuery = preg_replace('/(^| )-(S)/', '$1-$2', $escapedQuery);
$escapedQuery = preg_replace('/(^| )+(S)/', '$1+$2', $escapedQuery);
if ((substr_count($escapedQuery, '"') % 2) == 0) {
$escapedQuery = str_replace('"', '"', $escapedQuery);
}
$select->setQuery($escapedQuery);
}
}
} elseif ($req->getRequestFormat() === 'json') {
return JsonResponse::create(array(
'error' => 'Missing search query, example: ?q=example'
), 400)->setCallback($req->query->get('callback'));
}
return $this->render('SomeAppWebBundle:Web:search.html.twig');
}

27. public function searchAction(Request $req)
{
$form = $this->createForm(new SearchQueryType, new SearchQuery);
$this->computeSearchQuery($req, $filteredOrderBys);
$typeFilter = $req->query->get('type');
if ($req->query->has('search_query') || $typeFilter) {
/** @var $solarium Solarium_Client */
$solarium = $this->get('solarium.client');
$select = $solarium->createSelect();
// configure dismax
$dismax = $select->getDisMax();
$dismax->setQueryFields(array('name^4', 'description', 'tags', 'text', 'text_ngram', 'name_split^2'));
$dismax->setPhraseFields(array('description'));
$dismax->setBoostFunctions(array('log(trendiness)^10'));
$dismax->setMinimumMatch(1);
$dismax->setQueryParser('edismax');
// filter by type
if ($typeFilter) {
$filterQueryTerm = sprintf('type:"%s"', $select->getHelper()->escapeTerm($typeFilter));
$filterQuery = $select->createFilterQuery('type')->setQuery($filterQueryTerm);
$select->addFilterQuery($filterQuery);
}
if ($req->query->has('search_query')) {
$form->bind($req);
if ($form->isValid()) {
$escapedQuery = $select->getHelper()->escapeTerm($form->getData()->getQuery());
$escapedQuery = preg_replace('/(^| )-(S)/', '$1-$2', $escapedQuery);
$escapedQuery = preg_replace('/(^| )+(S)/', '$1+$2', $escapedQuery);
if ((substr_count($escapedQuery, '"') % 2) == 0) {
$escapedQuery = str_replace('"', '"', $escapedQuery);
}
$select->setQuery($escapedQuery);
}
}
$paginator = new Pagerfanta(new SolariumAdapter($solarium, $select));
$perPage = $req->query->getInt('per_page', 15);
if ($perPage <= 0 || $perPage > 100) {
if ($req->getRequestFormat() === 'json') {
return JsonResponse::create(array(
'status' => 'error',
'message' => 'The optional packages per_page parameter must be an integer between 1 and 100 (default: 15)',
), 400)->setCallback($req->query->get('callback'));
}
$perPage = max(0, min(100, $perPage));
}
} elseif ($req->getRequestFormat() === 'json') {
return JsonResponse::create(array(
'error' => 'Missing search query, example: ?q=example'
), 400)->setCallback($req->query->get('callback'));
}
return $this->render('SomeAppWebBundle:Web:search.html.twig');
}

28. {
$form = $this->createForm(new SearchQueryType, new SearchQuery);
$filteredOrderBys = $this->getFilteredOrderedBys($req);
$normalizedOrderBys = $this->getNormalizedOrderBys($filteredOrderBys);
$this->computeSearchQuery($req, $filteredOrderBys);
$typeFilter = $req->query->get('type');
$tagsFilter = $req->query->get('tags');
if ($req->query->has('search_query') || $typeFilter || $tagsFilter) {
/** @var $solarium Solarium_Client */
$solarium = $this->get('solarium.client');
$select = $solarium->createSelect();
// configure dismax
$dismax = $select->getDisMax();
$dismax->setQueryFields(array('name^4', 'description', 'tags', 'text', 'text_ngram', 'name_split^2'));
$dismax->setPhraseFields(array('description'));
$dismax->setBoostFunctions(array('log(trendiness)^10'));
$dismax->setMinimumMatch(1);
$dismax->setQueryParser('edismax');
// filter by type
if ($typeFilter) {
$filterQueryTerm = sprintf('type:"%s"', $select->getHelper()->escapeTerm($typeFilter));
$filterQuery = $select->createFilterQuery('type')->setQuery($filterQueryTerm);
$select->addFilterQuery($filterQuery);
}
// filter by tags
if ($tagsFilter) {
$tags = array();
foreach ((array) $tagsFilter as $tag) {
$tags[] = $select->getHelper()->escapeTerm($tag);
}
$filterQueryTerm = sprintf('tags:("%s")', implode('" AND "', $tags));
$filterQuery = $select->createFilterQuery('tags')->setQuery($filterQueryTerm);
$select->addFilterQuery($filterQuery);
}
if (!empty($filteredOrderBys)) {
$select->addSorts($normalizedOrderBys);
}
if ($req->query->has('search_query')) {
$form->bind($req);
if ($form->isValid()) {
$escapedQuery = $select->getHelper()->escapeTerm($form->getData()->getQuery());
$escapedQuery = preg_replace('/(^| )-(S)/', '$1-$2', $escapedQuery);
$escapedQuery = preg_replace('/(^| )+(S)/', '$1+$2', $escapedQuery);
if ((substr_count($escapedQuery, '"') % 2) == 0) {
$escapedQuery = str_replace('"', '"', $escapedQuery);
}
$select->setQuery($escapedQuery);
}
}
$paginator = new Pagerfanta(new SolariumAdapter($solarium, $select));
$perPage = $req->query->getInt('per_page', 15);
if ($perPage <= 0 || $perPage > 100) {
if ($req->getRequestFormat() === 'json') {
return JsonResponse::create(array(
'status' => 'error',
'message' => 'The optional packages per_page parameter must be an integer between 1 and 100 (default: 15)',
), 400)->setCallback($req->query->get('callback'));
}
$perPage = max(0, min(100, $perPage));
}
$paginator->setMaxPerPage($perPage);
$paginator->setCurrentPage($req->query->get('page', 1), false, true);
$metadata = array();
foreach ($paginator as $package) {
if (is_numeric($package->id)) {
$metadata['downloads'][$package->id] = $package->downloads;
$metadata['favers'][$package->id] = $package->favers;
}
}
if ($req->getRequestFormat() === 'json') {
try {
$result = array(
'results' => array(),
'total' => $paginator->getNbResults(),
);
} catch (Solarium_Client_HttpException $e) {
return JsonResponse::create(array(
'status' => 'error',
'message' => 'Could not connect to the search server',
), 500)->setCallback($req->query->get('callback'));
}
return JsonResponse::create($result)->setCallback($req->query->get('callback'));
}
if ($req->isXmlHttpRequest()) {
try {
return $this->render('PackagistWebBundle:Web:search.html.twig', array(
'packages' => $paginator,
'meta' => $metadata,
'noLayout' => true,
));
} catch (Twig_Error_Runtime $e) {
if (!$e->getPrevious() instanceof Solarium_Client_HttpException) {
throw $e;
}
return JsonResponse::create(array(
'status' => 'error',
'message' => 'Could not connect to the search server',
), 500)->setCallback($req->query->get('callback'));
}
}
return $this->render('PackagistWebBundle:Web:search.html.twig', array(
'packages' => $paginator,
'meta' => $metadata,
));
} elseif ($req->getRequestFormat() === 'json') {
return JsonResponse::create(array(
'error' => 'Missing search query, example: ?q=example'
), 400)->setCallback($req->query->get('callback'));
}
return $this->render('PackagistWebBundle:Web:search.html.twig');

29. {
$form = $this->createForm(new SearchQueryType, new SearchQuery);
$filteredOrderBys = $this->getFilteredOrderedBys($req);
$normalizedOrderBys = $this->getNormalizedOrderBys($filteredOrderBys);
$this->computeSearchQuery($req, $filteredOrderBys);
$typeFilter = $req->query->get('type');
$tagsFilter = $req->query->get('tags');
if ($req->query->has('search_query') || $typeFilter || $tagsFilter) {
/** @var $solarium Solarium_Client */
$solarium = $this->get('solarium.client');
$select = $solarium->createSelect();
// configure dismax
$dismax = $select->getDisMax();
$dismax->setQueryFields(array('name^4', 'description', 'tags', 'text', 'text_ngram', 'name_split^2'));
$dismax->setPhraseFields(array('description'));
$dismax->setBoostFunctions(array('log(trendiness)^10'));
$dismax->setMinimumMatch(1);
$dismax->setQueryParser('edismax');
// filter by type
if ($typeFilter) {
$filterQueryTerm = sprintf('type:"%s"', $select->getHelper()->escapeTerm($typeFilter));
$filterQuery = $select->createFilterQuery('type')->setQuery($filterQueryTerm);
$select->addFilterQuery($filterQuery);
}
// filter by tags
if ($tagsFilter) {
$tags = array();
foreach ((array) $tagsFilter as $tag) {
$tags[] = $select->getHelper()->escapeTerm($tag);
}
$filterQueryTerm = sprintf('tags:("%s")', implode('" AND "', $tags));
$filterQuery = $select->createFilterQuery('tags')->setQuery($filterQueryTerm);
$select->addFilterQuery($filterQuery);
}
if (!empty($filteredOrderBys)) {
$select->addSorts($normalizedOrderBys);
}
if ($req->query->has('search_query')) {
$form->bind($req);
if ($form->isValid()) {
$escapedQuery = $select->getHelper()->escapeTerm($form->getData()->getQuery());
$escapedQuery = preg_replace('/(^| )-(S)/', '$1-$2', $escapedQuery);
$escapedQuery = preg_replace('/(^| )+(S)/', '$1+$2', $escapedQuery);
if ((substr_count($escapedQuery, '"') % 2) == 0) {
$escapedQuery = str_replace('"', '"', $escapedQuery);
}
$select->setQuery($escapedQuery);
}
}
$paginator = new Pagerfanta(new SolariumAdapter($solarium, $select));
$perPage = $req->query->getInt('per_page', 15);
if ($perPage <= 0 || $perPage > 100) {
if ($req->getRequestFormat() === 'json') {
return JsonResponse::create(array(
'status' => 'error',
'message' => 'The optional packages per_page parameter must be an integer between 1 and 100 (default: 15)',
), 400)->setCallback($req->query->get('callback'));
}
$perPage = max(0, min(100, $perPage));
}
$paginator->setMaxPerPage($perPage);
$paginator->setCurrentPage($req->query->get('page', 1), false, true);
$metadata = array();
foreach ($paginator as $package) {
if (is_numeric($package->id)) {
$metadata['downloads'][$package->id] = $package->downloads;
$metadata['favers'][$package->id] = $package->favers;
}
}
if ($req->getRequestFormat() === 'json') {
try {
$result = array(
'results' => array(),
'total' => $paginator->getNbResults(),
);
} catch (Solarium_Client_HttpException $e) {
return JsonResponse::create(array(
'status' => 'error',
'message' => 'Could not connect to the search server',
), 500)->setCallback($req->query->get('callback'));
}
return JsonResponse::create($result)->setCallback($req->query->get('callback'));
}
if ($req->isXmlHttpRequest()) {
try {
return $this->render('PackagistWebBundle:Web:search.html.twig', array(
'packages' => $paginator,
'meta' => $metadata,
'noLayout' => true,
));
} catch (Twig_Error_Runtime $e) {
if (!$e->getPrevious() instanceof Solarium_Client_HttpException) {
throw $e;
}
return JsonResponse::create(array(
'status' => 'error',
'message' => 'Could not connect to the search server',
), 500)->setCallback($req->query->get('callback'));
}
}
return $this->render('PackagistWebBundle:Web:search.html.twig', array(
'packages' => $paginator,
'meta' => $metadata,
));
} elseif ($req->getRequestFormat() === 'json') {
return JsonResponse::create(array(
'error' => 'Missing search query, example: ?q=example'
), 400)->setCallback($req->query->get('callback'));
}
return $this->render('PackagistWebBundle:Web:search.html.twig');
{
$form = $this->createForm(new SearchQueryType, new SearchQuery);
$filteredOrderBys = $this->getFilteredOrderedBys($req);
$normalizedOrderBys = $this->getNormalizedOrderBys($filteredOrderBys);
$this->computeSearchQuery($req, $filteredOrderBys);
$typeFilter = $req->query->get('type');
$tagsFilter = $req->query->get('tags');
if ($req->query->has('search_query') || $typeFilter || $tagsFilter) {
/** @var $solarium Solarium_Client */
$solarium = $this->get('solarium.client');
$select = $solarium->createSelect();
// configure dismax
$dismax = $select->getDisMax();
$dismax->setQueryFields(array('name^4', 'description', 'tags', 'text', 'text_ngram', 'name_split^2'));
$dismax->setPhraseFields(array('description'));
$dismax->setBoostFunctions(array('log(trendiness)^10'));
$dismax->setMinimumMatch(1);
$dismax->setQueryParser('edismax');
// filter by type
if ($typeFilter) {
$filterQueryTerm = sprintf('type:"%s"', $select->getHelper()->escapeTerm($typeFilter));
$filterQuery = $select->createFilterQuery('type')->setQuery($filterQueryTerm);
$select->addFilterQuery($filterQuery);
}
// filter by tags
if ($tagsFilter) {
$tags = array();
foreach ((array) $tagsFilter as $tag) {
$tags[] = $select->getHelper()->escapeTerm($tag);
}
$filterQueryTerm = sprintf('tags:("%s")', implode('" AND "', $tags));
$filterQuery = $select->createFilterQuery('tags')->setQuery($filterQueryTerm);
$select->addFilterQuery($filterQuery);
}
if (!empty($filteredOrderBys)) {
$select->addSorts($normalizedOrderBys);
}
if ($req->query->has('search_query')) {
$form->bind($req);
if ($form->isValid()) {
$escapedQuery = $select->getHelper()->escapeTerm($form->getData()->getQuery());
$escapedQuery = preg_replace('/(^| )-(S)/', '$1-$2', $escapedQuery);
$escapedQuery = preg_replace('/(^| )+(S)/', '$1+$2', $escapedQuery);
if ((substr_count($escapedQuery, '"') % 2) == 0) {
$escapedQuery = str_replace('"', '"', $escapedQuery);
}
$select->setQuery($escapedQuery);
}
}
$paginator = new Pagerfanta(new SolariumAdapter($solarium, $select));
$perPage = $req->query->getInt('per_page', 15);
if ($perPage <= 0 || $perPage > 100) {
if ($req->getRequestFormat() === 'json') {
return JsonResponse::create(array(
'status' => 'error',
'message' => 'The optional packages per_page parameter must be an integer between 1 and 100 (default: 15)',
), 400)->setCallback($req->query->get('callback'));
}
$perPage = max(0, min(100, $perPage));
}
$paginator->setMaxPerPage($perPage);
$paginator->setCurrentPage($req->query->get('page', 1), false, true);
$metadata = array();
foreach ($paginator as $package) {
if (is_numeric($package->id)) {
$metadata['downloads'][$package->id] = $package->downloads;
$metadata['favers'][$package->id] = $package->favers;
}
}
if ($req->getRequestFormat() === 'json') {
try {
$result = array(
'results' => array(),
'total' => $paginator->getNbResults(),
);
} catch (Solarium_Client_HttpException $e) {
return JsonResponse::create(array(
'status' => 'error',
'message' => 'Could not connect to the search server',
), 500)->setCallback($req->query->get('callback'));
}
return JsonResponse::create($result)->setCallback($req->query->get('callback'));
}
if ($req->isXmlHttpRequest()) {
try {
return $this->render('PackagistWebBundle:Web:search.html.twig', array(
'packages' => $paginator,
'meta' => $metadata,
'noLayout' => true,
));
} catch (Twig_Error_Runtime $e) {
if (!$e->getPrevious() instanceof Solarium_Client_HttpException) {
throw $e;
}
return JsonResponse::create(array(
'status' => 'error',
'message' => 'Could not connect to the search server',
), 500)->setCallback($req->query->get('callback'));
}
}
return $this->render('PackagistWebBundle:Web:search.html.twig', array(
'packages' => $paginator,
'meta' => $metadata,
));
} elseif ($req->getRequestFormat() === 'json') {
return JsonResponse::create(array(
'error' => 'Missing search query, example: ?q=example'
), 400)->setCallback($req->query->get('callback'));
}
return $this->render('PackagistWebBundle:Web:search.html.twig');

30. CHANGE
KICKS IN AFTER
CREATION STOPS

31. Creation
→
Change
Project Lifetime
Beginning 3 months 6 months 9 months ...
Cost of Creation Cost of Change

32. Creation
→
Change
Project Lifetime
Beginning 3 months 6 months 9 months ...
Cost of Creation Cost of Change
Enterprise Project

33. Creation
→
Change
Project Lifetime
Beginning 3 months 6 months 9 months ...
Cost of Creation Cost of Change
Enterprise Project
Enterprise Project

34. FORCE DYNAMICS

35. CONVENTION-BASED
FRAMEWORK

37. Your first feature
Controlled Code

38. Controlled Code

39. Your second feature
Controlled Code

40. Controlled Code

41. Controlled Code

42. Delegated Code
The framework / library code
Controlled Code

43. Delegated Code Controlled Code

44. Delegated Code
Change
Controlled Code

45. Delegated Code
Change
Controlled Code

46. Delegated Code
Change
Controlled Code

47. Owned Code Delegated Code
Change
Controlled Code

48. Owned Code Delegated Code
Change
Controlled Code

49. Owned Code Delegated Code
Change
Controlled Code

50. Owned Code Delegated Code Controlled Code

51. Owned Code Controlled Code

52. – An engineer
“Ah, to hell with that!”

53. Owned Code

54. Owned Code
Change

55. Owned Code

56. ENTERPRISE
FRAMEWORK

58. Controlled Code
Your first feature

59. Controlled Code

60. Controlled Code
Your second feature

61. Controlled Code

62. Controlled Code
Change

63. Controlled Code
Change

64. Controlled Code
Change

65. – A business person
“Why does it always take so long?”

66. Controlled CodeOwned Code
Change

67. Controlled CodeOwned Code
Change

68. Controlled CodeOwned Code
Change

69. Controlled CodeOwned Code

70. Owned Code

71. CONTROL HAS COST

72. Project Lifetime
Beginning 3 months 6 months 9 months ...
Cost of Creation Cost of Change Cost of Control

73. CONTROL
IS A LIMITER FOR A
COST OF CHANGE

74. Project Lifetime
Beginning 3 months 6 months 9 months ...
Cost of Creation Cost of Change Cost of Control

75. CONTROLLING
TOO FEW
TOO LATE

76. Project Lifetime
Beginning 3 months 6 months 9 months ...
Cost of Creation Cost of Change Cost of Control

77. CONTROLLING
TOO MUCH
TOO EARLY

78. Project Lifetime
Beginning 3 months 6 months 9 months ...
Cost of Creation Cost of Change Cost of Control

79. OWNING MORE
THANYOU CONTROL
IS UNSUSTAINABLE

80. CONTROLLING
EVERYTHING
IS EXPENSIVE

81. MIN-MAXING
SOFTWARE COSTS

82. 4 RULES OF MIN-MAXING
1. Begin from owning nothing ( )
2. Take ownership reluctantly ( )
3. Control everything you own ( )
4. Continuously reassess your control ( )

83. HEALTHY YOUNG PROJECT
Owned Code Delegated Code Controlled Code

84. UNHEALTHY YOUNG PROJECT
Owned Code Delegated Code Controlled Code

85. UNHEALTHY YOUNG PROJECT
Owned Code Delegated Code Controlled Code

86. HEALTHY MATURE PROJECT
Owned Code Delegated Code Controlled Code

87. UNHEALTHY “MATURE” PROJECT
Owned Code Delegated Code Controlled Code

88. UNHEALTHY “MATURE” PROJECT
Owned Code Delegated Code Controlled Code

89. 1. BEGIN
FROM OWNING
NOTHING

90. 2.TAKE
OWNERSHIP
RELUCTANTLY

91. 3. CONTROL
EVERYTHING
YOU OWN

92. 4. CONTINUOUSLY
REASSESSYOUR
CONTROL

93. Project Lifetime
Beginning 3 months 6 months 9 months ...
Cost of Creation Cost of Change Cost of Control

94. Control everything you write.
Avoid writing anything.

95. Deliver business impact,
not software.

96. THANK YOU
FORYOURTIME!
Konstantin K.
@everzet