Holdings: Simple architectures for complex enterprises

Simple architectures for complex enterprises:

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Bibliographic Details
Main Author:	Sessions, Roger 1951- (Author)
Format:	Book
Language:	English
Published:	Redmond, Wash. Microsoft Press 2008
Series:	Best practices
Subjects:	System design Computer architecture Unternehmen Datenverarbeitung Projektmanagement
Online Access:	Inhaltsverzeichnis
Physical Description:	XXII, 181 S. Ill.
ISBN:	0735625786 9780735625785

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MARC


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adam_txt	Titel: Simple architectures for complex enterprises Autor: Sessions, Roger Jahr: 2008 Table of Contents Acknowledgments.xiii Introduction.xv The Organization of This Book.xx Find Additional Content Online.xxi Support for This Book.xxi Questions and Comments.xxii Part I The Question of Complexity 1 Enterprise Architecture Today.3 Why Bother?.3 Issue: Unreliable Enterprise Information.4 Issue: Untimely Enterprise Information.4 Issue: New Complex Projects Underway.4 Issue: New Companies Being Acquired.5 Issue: Enterprise Wants to Spin Off Unit.5 Issue: Need to Identify Outsourcing Opportunities.5 Issue: Regulatory Requirements.5 Issue: Need to Automate Relationships with External Partners.6 Issue: Need to Automate Relationships with Customers.6 Issue: Poor Relationship Between IT and Business Units.6 Issue: Poor Interoperability of IT Systems.6 Issue: IT Systems Unmanageable.7 The Value of Enterprise Architecture.7 Common Definitions.7 What Is Enterprise Architecture?.8 Complexity in Enterprise Architectures.10 - What do you think of this book? We want to hear from you! .Microsoft is interested in hearing your feedback so we can continually improve our books and [earning resources for you. To participate in a brief online survey, please visit: www.microsoft.com/learning/booksurvey VII vüi Table of Contents The Zachman Framework for Enterprise Architectures.15 The Open Group Architecture Framework.20 Federal Enterprise Architecture .26 Summary.33 2 A First Look at Complexity.35 Partitioning.35 Executive Lunch.35 Choir Rehearsal.36 Emergency Responses.37 Clothing Store.38 Chess Games.38 Children at Starbucks.39 Rubik's Cube.40 Five Laws of Partitions.42 First Law: Partitions Must Be True Partitions.42 Second Law: Partition Definitions Must Be Appropriate.43 Third Law: Partition Subset Numbers Must Be Appropriate.44 Fourth Law: Partition Subset Sizes Must Be Roughly Equal.44 Fifth Law: Subset Interactions Must Be Minimal and Well Defined.45 Simplification.45 Iteration.46 Summary.52 3 Mathematics of Complexity.53 Looking at Complexity.54 Laws of Complexity.58 Homomorphisms.60 Controlling Complexity in Dice Systems.61 Adding Buckets.62 Partitioning.65 Equivalence Relations.67 Equivalence Classes.71 Inverse Equivalence Relations.72 Equivalence Relations and Enterprise Architectures.73 Synergistic in Practice.76 Removing Faces.77 Table of Contents ix Removing Buckets.79 Other Measures of Complexity.80 Complexity in Theory and in Practice.81 Summary.83 Part II The Quest for Simplification 4 The ABCs of Enterprise Partitions.87 Review of the Mathematics.87 Partitioning the Enterprise.88 The ABCs of Enterprise Equivalence Classes.89 ABC-Type Relationships.90 Implementations and Deployments.93 ABC Types.95 Type Hierarchies.96 Composition Relationships.98 Partner Relationships.99 Relationships and Partition Simplification.100 Retail Operation, Again.102 Summary.106 5 SIP Process.107 Overview.107 Phase 0: Enterprise Architecture Evaluation.108 Issue: Unreliable Enterprise Information.109 Issue: Untimely Enterprise Information.109 Issue: New Complex Projects Underway.110 Issue: New Companies Being Acquired.110 Issue: Enterprise Wants to Spin Off Unit.Ill Issue: Need to Identify Outsourcing Opportunities.Ill Issue: Regulatory Requirements.112 Issue: Need to Automate Relationships with External Partners.112 Issue: Need to Automate Relationships with Customers.113 Issue: Poor Relationship Between IT and Business Units.113 Issue: Poor Interoperability of IT Systems.113 Issue: IT Systems Unmanageable.114 Contraindications.114 Table of Contents Phase 1: SIP Preparation.115 Audit of Organizational Readiness.115 Training.116 Governance Model.116 SIP Blend.117 Enterprise-Specific Tools.117 Phase 2: Partitioning.118 Phase 3: Partition Simplification.121 Phase 4: ABC Prioritization.124 Phase 5: ABC Iteration.127 Summary.128 6 A Case Study in Complexity.129 Overview of NPfIT.129 Current Status of NPfIT.132 The SIP Approach.135 Summary.145 7 Guarding the Boundaries: Software Fortresses.147 Technical Partitions.147 Rule 1: Autonomy.152 Rule 2: Explicit Boundaries.152 Rule 3: Partitioning of Functionality.153 Rule 4: Dependencies Defined by Policy.153 Rule 5: Asynchronicity.153 Rule 6: Partitioning of Data.154 Rule 7: No Cross-Fortress Transactions.155 Rule 8: Single-Point Security.156 Rule 9: Inside Trust.156 Rule 10: Keep It Simple.156 Summary.157 8 The Path Forward.159 Complexity: The Real Enemy.160 Simplicity Pays.161 A Philosophy of Simplicity.164 A Review of the Book Content.165 A Parting Message.166 Table of Contents xi A This Book at a Glance.169 Mathematical Concepts.169 Mathematical Definition of a Partition.169 Five Laws of Partitions.169 Measuring States in a System of Dice-Like Systems.170 Homomorphism.170 Equivalence Relations.170 Inverse Equivalence Relations.171 Partitions.171 Partitioning Algorithm for Equivalence Relations.171 Enterprise Architectural Concepts.172 Preferred Definition of Enterprise Architecture.172 Definition of Optimal Architecture.172 Boyd's Law of Iteration.172 Laws of Enterprise Complexity.172 Synergistic and Autonomous.173 SIP Concepts.173 Definition of SIP.173 The SIP Process.173 ABC.174 Software Fortress Model.175 Three Styles of ABC Communications.176 The SIP Mantra.176 Index.177 What do you think of this book? We want to hear from you! (Microsoft is interested in hearing your feedback so we can continually improve our books and learning resources for you. To participate in a brief online survey, please visit: sswww.tnicrosoft.com/leaming/booksurveys
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spelling	Sessions, Roger 1951- Verfasser (DE-588)128963352 aut Simple architectures for complex enterprises Roger Sessions Best practices simple architectures for complex enterprises Redmond, Wash. Microsoft Press 2008 XXII, 181 S. Ill. txt rdacontent n rdamedia nc rdacarrier Best practices System design Computer architecture Unternehmen (DE-588)4061963-1 gnd rswk-swf Datenverarbeitung (DE-588)4011152-0 gnd rswk-swf Projektmanagement (DE-588)4047441-0 gnd rswk-swf Unternehmen (DE-588)4061963-1 s Datenverarbeitung (DE-588)4011152-0 s Projektmanagement (DE-588)4047441-0 s b DE-604 HBZ Datenaustausch https://bvbr.bib-bvb.de:443/F?func=service&doc_library=BVB01&local_base=BVB01&doc_number=016747214&sequence=000002&line_number=0001&func_code=DB_RECORDS&service_type=MEDIA Inhaltsverzeichnis
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title	Simple architectures for complex enterprises
title_alt	Best practices simple architectures for complex enterprises
title_auth	Simple architectures for complex enterprises
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title_full	Simple architectures for complex enterprises Roger Sessions
title_fullStr	Simple architectures for complex enterprises Roger Sessions
title_full_unstemmed	Simple architectures for complex enterprises Roger Sessions
title_short	Simple architectures for complex enterprises
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