Improving Development Flow

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IMPROVING DEVELOPMENT FLOW INTRODUCTORY MATERIAL

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LEAN PRINCIPLES ELIMINATE WASTE DEFER DECISIONS 360º PANORAMA BUILT-IN QUALITY DELIVER LEARN

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LEAN PRINCIPLES ELIMINATE WASTE DEFER DECISIONS 360º PANORAMA BUILT-IN QUALITY DEVOPS ARCHITECTURE MANAGEMENT CODING

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DEVELOPMENT FLOW CLEAN ARCHITECTURE LEAN MANAGEMENT SMART OPERATIONS TEAM CULTURE BEAUTIFUL CODE MEASURABLE UX Key Elements

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PRESERVING DEVELOPMENT FLOW COST ($) GOOD CODE DIRTY CODE TIME (⌚)

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PRESERVING DEVELOPMENT FLOW DIRTY CODE NO FUTURE BANKRUPTCY REWRITE OPPORTUNITY X COST ($) TIME (⌚)

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PRESERVING DEVELOPMENT FLOW TIME REMAINING WORK PLANNED RELEASE FULL QUALITY RELEASE TECHNICAL DEBT Pressure applied RESULT On time, On budget CLAIM Productivity improved

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BOOST FLUIDITY ADAPTABILITY SHRINK VISCOSITY STAGNATION PRESERVING DEVELOPMENT FLOW

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SOFTWARE QUALITY PORTABILITY MAINTAINABILITY EFFICIENCY RELIABILITY FUNCTIONALITY USABILITY INTERNAL EXTERNAL QUALITY ISO9126

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SOFTWARE COMPLEXITY PROGRAMMER PROGRAM coding testing debugging modifying DIFFICULTY

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SOFTWARE METRICS SIZE Source Lines of Code - SLOC METHOD Test Code Coverage - TCC Cyclomatic Complexity - CC CLASS / MODULE Comment Percentage - CP Lack of Cohesion in Methods - LCOM Coupling Between Object Classes - CBO # Methods, Files, Classes &c.

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SIZE Less is more. Sometimes...

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SIZE ARTIFACTS DEVELOPMENT RUNTIME Disk Memory Source code DEPLOYMENT Packages Network Feature creep Patchwork Automated tools Heavyweight frameworks Careless packaging FATTEN SOURCES

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SOURCE CODE SURFACE SLOC # CLASSES # PACKAGES

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METHODS

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CYCLOMATIC COMPLEXITY Number of independent execution paths

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M = E - N + 2P WHERE entry for loop exit CYCLOMATIC NUMBER E = # Edges N = # Nodes P = # Exit nodes

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M = 5 - 5 + 2 1 2 3 4 5 CYCLOMATIC NUMBER 2 1 2 3 5 4

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CYCLOMATIC NUMBER 2 1 10 5 SAFE DANGEROUS HIGHLY DANGEROUS CATASTROPHIC

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TEST CODE COVERAGE COMPLIANCE LEVELS Test Effectiveness Ratio - TER Statement Control-flow branches Linear Code Sequence and Jump - LCSAJ TER1 TER2 TER3

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CLASS / MODULE

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FAN-IN FAN-OUT CHILDREN COUPLING Depth of inheritance

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The most effectively modular system is the one for which the sum of functional relatedness between pairs of elements not in the same module is minimized; among other things, this tends to minimize the required number of intermodular connections and the amount of intermodular coupling. For each module in isolation, how tightly bound or related its internal elements are to one another. Edward Yourdon & Larry L. Constantine Structured Design “ COHESION

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EQUILIBRIUM

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EQUILIBRIUM Multi-level Quality & Planning Key abstractions Well defined boundaries Clean interactions SEMANTICS FOCUS Visualize project state Minimize time-boxing Avoid isolation Forget frameworks EMBODIMENT

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GET INTO FLOW State of mind in which awareness and action become one

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HAVE FUN HARD FUN SERIOUS FUN Challenge Mastery Accomplishment Purpose Focus Meaning S.M.A.R.T GOALS CELEBRATE CONTINUOUS REINFORCEMENT