diff --git a/BuildTasks/BuildManifest.Task.ps1 b/BuildTasks/BuildManifest.Task.ps1
index ef5f460..343e0e3 100644
--- a/BuildTasks/BuildManifest.Task.ps1
+++ b/BuildTasks/BuildManifest.Task.ps1
@@ -14,93 +14,5 @@ taskx BuildManifest @{
             'Setting FunctionsToExport...'
             Set-ModuleFunctions -Name $ManifestPath -FunctionsToExport $functions.BaseName
         }
-
-        'Detecting semantic versioning...'
-        "Importing Module [$ManifestPath]..."
-        Import-Module -FullyQualifiedName $ManifestPath
-
-        "Get-Command -Module [$ModuleName]..."
-        $commands = Get-Command -Module $ModuleName
-
-        "Removing Module [$ModuleName]..."
-        Remove-Module -Name $ModuleName -Force
-
-        'Calculating fingerprint...'
-        $fingerprint = foreach ($command in $commands)
-        {
-            foreach ($parameter in $command.Parameters.Keys)
-            {
-                if($false -eq $command.Parameters[$parameter].IsDynamic)
-                {
-                    '{0}:{1}' -f $command.Name, $command.Parameters[$parameter].Name
-                    foreach ($alias in $command.Parameters[$parameter].Aliases)
-                    {
-                        '{0}:{1}' -f $command.Name, $alias
-                    }
-                }
-            }
-        }
-
-        $fingerprint = $fingerprint | Sort-Object
-
-        if (Test-Path -Path '.\fingerprint')
-        {
-            $oldFingerprint = Get-Content -Path '.\fingerprint'
-        }
-
-        $bumpVersionType = 'Patch'
-
-        'Detecting new features...'
-        $features = $fingerprint |
-            Where-Object { $_ -notin $oldFingerprint }
-
-        foreach ($feature in $features)
-        {
-            $feature
-            $bumpVersionType = 'Minor'
-        }
-
-        'Detecting breaking changes...'
-        $breakingChanges = $oldFingerprint |
-            Where-Object { $_ -notin $fingerprint }
-
-        foreach ($breakingChange in $breakingChanges)
-        {
-            $breakingChange
-            $bumpVersionType = 'Major'
-        }
-
-        Set-Content -Path '.\fingerprint' -Value $fingerprint
-
-        # Bump the module version
-        $version = [version] (Get-Metadata -Path $manifestPath -PropertyName 'ModuleVersion')
-
-        if ($version -lt ([version] '1.0.0'))
-        {
-            "Module is still in beta; don't bump major version."
-            if ($bumpVersionType -eq 'Major')
-            {
-                $bumpVersionType = 'Minor'
-            }
-            else
-            {
-                $bumpVersionType = 'Patch'
-            }
-        }
-
-        "Stepping [$bumpVersionType] version [$version]..."
-        $version = [version] (Step-Version -Version $version -Type $bumpVersionType)
-
-        $build = 1
-        if ($null -ne $env:Build_BuildID)
-        {
-            $build = $env:Build_BuildID
-        }
-
-        $version = [version]::new($version.Major, $version.Minor, $version.Build, $build)
-        "Using version [$version]..."
-        "##vso[build.updatebuildnumber]$version"
-
-        Update-Metadata -Path $ManifestPath -PropertyName 'ModuleVersion' -Value $version
     }
 }
diff --git a/BuildTasks/ImportDevModule.Task.ps1 b/BuildTasks/ImportDevModule.Task.ps1
index c852471..ea36fcc 100644
--- a/BuildTasks/ImportDevModule.Task.ps1
+++ b/BuildTasks/ImportDevModule.Task.ps1
@@ -1,21 +1,4 @@
 
 task ImportDevModule {
-
-    if (-not(Test-Path -Path "$Source\$ModuleName.psd1"))
-    {
-        "Module [$ModuleName] is not built; cannot find [$Source\$ModuleName.psd1]."
-        Write-Error -Message "Could not find module manifest [$Source\$ModuleName.psd1]."
-    }
-    else
-    {
-        $loaded = Get-Module -Name $ModuleName -All
-        if ($loaded)
-        {
-            "Unloading Module [$ModuleName] from a previous import..."
-            $loaded | Remove-Module -Force
-        }
-
-        "Importing Module [$ModuleName] from [$Source\$ModuleName.psd1]..."
-        Import-Module -FullyQualifiedName "$Source\$ModuleName.psd1" -Force
-    }
+    ImportModule -Path "$Source\$ModuleName.psd1"
 }
diff --git a/BuildTasks/ImportModule.Task.ps1 b/BuildTasks/ImportModule.Task.ps1
index dfe72c6..a903b45 100644
--- a/BuildTasks/ImportModule.Task.ps1
+++ b/BuildTasks/ImportModule.Task.ps1
@@ -1,20 +1,33 @@
+function ImportModule
+{
+    param(
+        [string]$path,
+        [switch]$PassThru
+    )
 
-task ImportModule {
-    if (-not(Test-Path -Path $ManifestPath))
+
+    if (-not(Test-Path -Path $path))
     {
-        "Module [$ModuleName] is not built; cannot find [$ManifestPath]."
-        Write-Error -Message "Could not find module manifest [$ManifestPath]. You may need to build the module first."
+        "Cannot find [$path]."
+        Write-Error -Message "Could not find module manifest [$path]"
     }
     else
     {
-        $loaded = Get-Module -Name $ModuleName -All
+        $file = Get-Item $path
+        $name = $file.BaseName
+
+        $loaded = Get-Module -Name $name -All -ErrorAction Ignore
         if ($loaded)
         {
-            "Unloading Module [$ModuleName] from a previous import..."
+            "Unloading Module [$name] from a previous import..."
             $loaded | Remove-Module -Force
         }
 
-        "Importing Module [$ModuleName] from [$ManifestPath]..."
-        Import-Module -FullyQualifiedName $ManifestPath -Force
+        "Importing Module [$name] from [$($file.fullname)]..."
+        Import-Module -Name $file.fullname -Force -PassThru:$PassThru
     }
 }
+
+task ImportModule {
+    ImportModule -Path $ManifestPath
+}
diff --git a/BuildTasks/FullTests.Task.ps1 b/BuildTasks/Pester.Task.ps1
similarity index 80%
rename from BuildTasks/FullTests.Task.ps1
rename to BuildTasks/Pester.Task.ps1
index 28f9e7a..528a343 100644
--- a/BuildTasks/FullTests.Task.ps1
+++ b/BuildTasks/Pester.Task.ps1
@@ -1,7 +1,7 @@
-task FullTests {
+task Pester {
+    $requiredPercent = $Script:CodeCoveragePercent
+
     $params = @{
-        CodeCoverage           = 'Output\*\*.psm1'
-        CodeCoverageOutputFile = 'Output\codecoverage.xml'
         OutputFile             = $testFile
         OutputFormat           = 'NUnitXml'
         PassThru               = $true
@@ -10,13 +10,18 @@ task FullTests {
         Tag                    = 'Build'
     }
 
+    if($requiredPercent -gt 0.00)
+    {
+        $params['CodeCoverage'] = 'Output\*\*.psm1'
+        $params['CodeCoverageOutputFile'] = 'Output\codecoverage.xml'
+    }
+
     $results = Invoke-Pester @params
     if ($results.FailedCount -gt 0)
     {
         Write-Error -Message "Failed [$($results.FailedCount)] Pester tests."
     }
 
-    $requiredPercent = $Script:CodeCoveragePercent
     $codeCoverage = $results.codecoverage.NumberOfCommandsExecuted / $results.codecoverage.NumberOfCommandsAnalyzed
     if($codeCoverage -lt $requiredPercent)
     {
diff --git a/BuildTasks/PublishVersion.Task.ps1 b/BuildTasks/PublishVersion.Task.ps1
new file mode 100644
index 0000000..79c9eba
--- /dev/null
+++ b/BuildTasks/PublishVersion.Task.ps1
@@ -0,0 +1,7 @@
+task PublishVersion {
+    [version] $sourceVersion = (Get-Metadata -Path $manifestPath -PropertyName 'ModuleVersion')
+    "##vso[build.updatebuildnumber]$sourceVersion"
+
+    # Do the same for appveyor
+    # https://www.appveyor.com/docs/build-worker-api/#update-build-details
+}
diff --git a/BuildTasks/SetVersion.Task.ps1 b/BuildTasks/SetVersion.Task.ps1
new file mode 100644
index 0000000..715af54
--- /dev/null
+++ b/BuildTasks/SetVersion.Task.ps1
@@ -0,0 +1,121 @@
+function GetModulePublicInterfaceMap
+{
+    param($Path)
+    $module = ImportModule -Path $Path -PassThru
+    $exportedCommands = @(
+        $module.ExportedFunctions.values
+        $module.ExportedCmdlets.values
+        $module.ExportedAliases.values
+    )
+
+    foreach($command in $exportedCommands)
+    {
+        foreach ($parameter in $command.Parameters.Keys)
+        {
+            if($false -eq $command.Parameters[$parameter].IsDynamic)
+            {
+                '{0}:{1}' -f $command.Name, $command.Parameters[$parameter].Name
+                foreach ($alias in $command.Parameters[$parameter].Aliases)
+                {
+                    '{0}:{1}' -f $command.Name, $alias
+                }
+            }
+        }
+    }
+}
+
+task SetVersion {
+    $version = $null
+
+    $versionStamp = (git rev-parse origin/master) + (git rev-parse head)
+
+    "Load current version"
+    [version] $sourceVersion = (Get-Metadata -Path $manifestPath -PropertyName 'ModuleVersion')
+    "  Source version [$sourceVersion]"
+
+    $downloadFolder = Join-Path -Path $output downloads
+    $null = New-Item -ItemType Directory -Path $downloadFolder -Force -ErrorAction Ignore
+
+    $versionFile = Join-Path $downloadFolder versionfile
+    if(Test-Path $versionFile)
+    {
+        $versionFileData = Get-Content $versionFile -raw
+        if($versionFileData -eq $versionStamp)
+        {
+            continue
+        }
+    }
+
+    "Checking for published version"
+    $publishedModule = Find-Module -Name $ModuleName |
+        Sort-Object -Property {[version]$_.Version} -Descending |
+        Select -First 1
+
+    [version] $publishedVersion = $publishedModule.Version
+    "  Published version [$publishedVersion]"
+
+    $version = $publishedVersion
+
+    "Downloading published module to check for breaking changes"
+    $publishedModule | Save-Module -Path $downloadFolder
+
+    [System.Collections.Generic.HashSet[string]] $publishedInterface = GetModulePublicInterfaceMap -Path (Join-Path $downloadFolder $ModuleName)
+    [System.Collections.Generic.HashSet[string]] $buildInterface = GetModulePublicInterfaceMap -Path $ManifestPath
+
+    $bumpVersionType = 'Patch'
+    if( -not $publishedInterface.IsSubsetOf($buildInterface))
+    {
+        $bumpVersionType = 'Major'
+    }
+    elseif ($publishedInterface.count -ne $buildInterface.count)
+    {
+        $bumpVersionType = 'Minor'
+    }
+
+    if ($version -lt ([version] '1.0.0'))
+    {
+        "Module is still in beta; don't bump major version."
+        if ($bumpVersionType -eq 'Major')
+        {
+            $bumpVersionType = 'Minor'
+        }
+        else
+        {
+            $bumpVersionType = 'Patch'
+        }
+    }
+
+    "  Steping version [$bumpVersionType]"
+    $version = [version] (Step-Version -Version $version -Type $bumpVersionType)
+
+    if ($null -ne $env:Build_BuildID)
+    {
+        $build = $env:Build_BuildID
+        $version = [version]::new($version.Major, $version.Minor, $version.Build, $build)
+    }
+    elseif ($null -ne $env:APPVEYOR_BUILD_ID)
+    {
+        $build = $env:APPVEYOR_BUILD_ID
+        $version = [version]::new($version.Major, $version.Minor, $version.Build, $build)
+    }
+
+    "  Comparing to source version [$sourceVersion]"
+    if($sourceVersion -gt $version)
+    {
+        "    Using existing version"
+        $version = $sourceVersion
+    }
+    "  Setting version [$version]"
+    Update-Metadata -Path $ManifestPath -PropertyName 'ModuleVersion' -Value $version
+
+    (Get-Content -Path $ManifestPath -Raw -Encoding UTF8) |
+        % trimend |
+        Set-Content -Path $ManifestPath -Encoding UTF8
+
+    Set-Content -Path $versionFile -Value $versionStamp -NoNewline -Encoding UTF8
+
+    if(Test-Path $BuildRoot\fingerprint)
+    {
+        Remove-Item $BuildRoot\fingerprint
+    }
+}
diff --git a/Module.build.ps1 b/Module.build.ps1
index 3eeb453..f549433 100644
--- a/Module.build.ps1
+++ b/Module.build.ps1
@@ -2,11 +2,13 @@ $Script:ModuleName = Get-ChildItem .\*\*.psm1 | Select-object -ExpandProperty Ba
 $Script:CodeCoveragePercent = 0.0 # 0 to 1
 . $psscriptroot\BuildTasks\InvokeBuildInit.ps1
 
-task Default Build, Test, UpdateSource
-task Build Copy, Compile, BuildModule, BuildManifest, Helpify
+task Default Build, Helpify, Test, UpdateSource
+task Build Copy, Compile, BuildModule, BuildManifest, SetVersion
 task Helpify GenerateMarkdown, GenerateHelp
-task Test Build, ImportModule, FullTests
-task Publish Build, Test, PublishModule
+task Test Build, ImportModule, Pester
+task Publish Build, PublishVersion, Helpify, Test, PublishModule
+task TFS Clean, Build, PublishVersion, Helpify, Test
+task DevTest ImportDevModule, Pester
 
 Write-Host 'Import common tasks'
 Get-ChildItem -Path $buildroot\BuildTasks\*.Task.ps1 |