diff --git a/lib/icinga/checkresult.psm1 b/lib/icinga/checkresult.psm1
new file mode 100644
index 0000000..4ce1716
--- /dev/null
+++ b/lib/icinga/checkresult.psm1
@@ -0,0 +1 @@
+Import-IcingaDirectoryModules -LibDirectory (Join-Path -Path $PSScriptRoot -ChildPath $MyInvocation.MyCommand.Name);
diff --git a/lib/icinga/checkresult/New-IcingaCheck.psm1 b/lib/icinga/checkresult/New-IcingaCheck.psm1
new file mode 100644
index 0000000..28ce500
--- /dev/null
+++ b/lib/icinga/checkresult/New-IcingaCheck.psm1
@@ -0,0 +1,311 @@
+Import-IcingaLib icinga\enums;
+
+function New-IcingaCheck()
+{
+    param(
+        [string]$Name = '',
+        $Value        = $null,
+        $Unit         = $null
+    );
+
+    $Check = New-Object -TypeName PSObject;
+    $Check | Add-Member -membertype NoteProperty -name 'name'     -value $Name;
+    $Check | Add-Member -membertype NoteProperty -name 'messages' -value @();
+    $Check | Add-Member -membertype NoteProperty -name 'value'    -value $Value;
+    $Check | Add-Member -membertype NoteProperty -name 'exitcode' -value -1;
+    $Check | Add-Member -membertype NoteProperty -name 'unit'     -value $Unit;
+
+    $Check | Add-Member -membertype ScriptMethod -name 'WarnIfLike' -value {
+        param($warning);
+
+        if ($this.value -Like $warning) {
+            $this.AddInternalCheckMessage(
+                $IcingaEnums.IcingaExitCode.Warning,
+                $warning,
+                'like'
+            );
+        }
+
+        return $this;
+    }
+
+    $Check | Add-Member -membertype ScriptMethod -name 'WarnIfNotLike' -value {
+        param($warning);
+
+        if (-Not ($this.value -Like $warning)) {
+            $this.AddInternalCheckMessage(
+                $IcingaEnums.IcingaExitCode.Warning,
+                $warning,
+                'not like'
+            );
+        }
+
+        return $this;
+    }
+
+    $Check | Add-Member -membertype ScriptMethod -name 'WarnIfMatch' -value {
+        param($warning);
+
+        if ($this.value -eq $warning) {
+            $this.AddInternalCheckMessage(
+                $IcingaEnums.IcingaExitCode.Warning,
+                $warning,
+                'matching'
+            );
+        }
+
+        return $this;
+    }
+
+    $Check | Add-Member -membertype ScriptMethod -name 'WarnIfNotMatch' -value {
+        param($warning);
+
+        if ($this.value -ne $warning) {
+            $this.AddInternalCheckMessage(
+                $IcingaEnums.IcingaExitCode.Warning,
+                $warning,
+                'not matching'
+            );
+        }
+
+        return $this;
+    }
+
+    $Check | Add-Member -membertype ScriptMethod -name 'WarnIfLowerThan' -value {
+        param($warning);
+
+        if ($this.value -lt $warning) {
+            $this.AddInternalCheckMessage(
+                $IcingaEnums.IcingaExitCode.Warning,
+                $warning,
+                'lower than'
+            );
+        }
+
+        return $this;
+    }
+
+    $Check | Add-Member -membertype ScriptMethod -name 'WarnIfLowerEqualThan' -value {
+        param($warning);
+
+        if ($this.value -le $warning) {
+            $this.AddInternalCheckMessage(
+                $IcingaEnums.IcingaExitCode.Warning,
+                $warning,
+                'lower or equal than'
+            );
+        }
+
+        return $this;
+    }
+
+    $Check | Add-Member -membertype ScriptMethod -name 'WarnIfGreaterThan' -value {
+        param($warning);
+
+        if ($this.value -gt $warning) {
+            $this.AddInternalCheckMessage(
+                $IcingaEnums.IcingaExitCode.Warning,
+                $warning,
+                'greater than'
+            );
+        }
+
+        return $this;
+    }
+
+    $Check | Add-Member -membertype ScriptMethod -name 'WarnIfGreaterEqualThan' -value {
+        param($warning);
+
+        if ($this.value -ge $warning) {
+            $this.AddInternalCheckMessage(
+                $IcingaEnums.IcingaExitCode.Warning,
+                $warning,
+                'greater or equal than'
+            );
+        }
+
+        return $this;
+    }
+
+    $Check | Add-Member -membertype ScriptMethod -name 'CritIfLike' -value {
+        param($critical);
+
+        if ($this.value -Like $critical) {
+            $this.AddInternalCheckMessage(
+                $IcingaEnums.IcingaExitCode.Critical,
+                $critical,
+                'like'
+            );
+        }
+
+        return $this;
+    }
+
+    $Check | Add-Member -membertype ScriptMethod -name 'CritIfNotLike' -value {
+        param($critical);
+
+        if (-Not ($this.value -Like $critical)) {
+            $this.AddInternalCheckMessage(
+                $IcingaEnums.IcingaExitCode.Critical,
+                $critical,
+                'not like'
+            );
+        }
+
+        return $this;
+    }
+
+    $Check | Add-Member -membertype ScriptMethod -name 'CritIfMatch' -value {
+        param($critical);
+
+        if ($this.value -eq $critical) {
+            $this.AddInternalCheckMessage(
+                $IcingaEnums.IcingaExitCode.Critical,
+                $critical,
+                'matching'
+            );
+        }
+
+        return $this;
+    }
+
+    $Check | Add-Member -membertype ScriptMethod -name 'CritIfNotMatch' -value {
+        param($critical);
+
+        if ($this.value -ne $critical) {
+            $this.AddInternalCheckMessage(
+                $IcingaEnums.IcingaExitCode.Critical,
+                $critical,
+                'not matching'
+            );
+        }
+
+        return $this;
+    }
+
+    $Check | Add-Member -membertype ScriptMethod -name 'CritIfLowerThan' -value {
+        param($critical);
+
+        if ($this.value -lt $critical) {
+            $this.AddInternalCheckMessage(
+                $IcingaEnums.IcingaExitCode.Critical,
+                $critical,
+                'lower than'
+            );
+        }
+
+        return $this;
+    }
+
+    $Check | Add-Member -membertype ScriptMethod -name 'CritIfLowerEqualThan' -value {
+        param($critical);
+
+        if ($this.value -le $critical) {
+            $this.AddInternalCheckMessage(
+                $IcingaEnums.IcingaExitCode.Critical,
+                $critical,
+                'lower or equal than'
+            );
+        }
+
+        return $this;
+    }
+
+    $Check | Add-Member -membertype ScriptMethod -name 'CritIfGreaterThan' -value {
+        param($critical);
+
+        if ($this.value -gt $critical) {
+            $this.AddInternalCheckMessage(
+                $IcingaEnums.IcingaExitCode.Critical,
+                $critical,
+                'greater than'
+            );
+        }
+
+        return $this;
+    }
+
+    $Check | Add-Member -membertype ScriptMethod -name 'CritIfGreaterEqualThan' -value {
+        param($critical);
+
+        if ($this.value -ge $critical) {
+            $this.AddInternalCheckMessage(
+                $IcingaEnums.IcingaExitCode.Critical,
+                $critical,
+                'greater or equal than'
+            );
+        }
+
+        return $this;
+    }
+
+    $Check | Add-Member -membertype ScriptMethod -name 'AddInternalCheckMessage' -value {
+        param($state, $value, $type);
+
+        $this.SetExitCode($state);
+        $this.AddMessage([string]::Format(
+            '{0} {1}{4} is {2} {3}{4}', $this.name, $this.value, $type, $value, $this.unit
+        ), $state);
+    }
+
+    $Check | Add-Member -membertype ScriptMethod -name 'AddMessage' -value {
+        param($message, $exitcode);
+
+        $this.messages += [string]::Format(
+                              '{0}: {1}',
+                              $IcingaEnums.IcingaExitCodeText[$exitcode],
+                              $message
+                          );
+    }
+
+    $Check | Add-Member -membertype ScriptMethod -name 'SetExitCode' -value {
+        param([int]$code);
+
+        # Only overwrite the exit code in case our new value is greater then
+        # the current one Ok > Warning > Critical
+        if ([int]$this.exitcode -gt $code) {
+            return $this;
+        }
+
+        $this.exitcode = $code;
+    }
+
+    $Check | Add-Member -membertype ScriptMethod -name 'WriteUnitError' -value {
+        if ($null -ne $this.unit -And (-Not $IcingaEnums.IcingaMeasurementUnits.ContainsKey($this.unit))) {
+            Write-Host (
+                [string]::Format(
+                    'Error: Usage of invalid plugin unit "{0}". Allowed units are: {1}',
+                    $this.unit,
+                    (($IcingaEnums.IcingaMeasurementUnits.Keys | Sort-Object name)  -Join ', ')
+                )
+            );
+        }
+    }
+
+    $Check | Add-Member -membertype ScriptMethod -name 'AddOkOutput' -value {
+        if ([int]$this.exitcode -eq -1) {
+            $this.exitcode = $IcingaEnums.IcingaExitCode.Ok;
+            $this.AddMessage([string]::Format('{0} is {1}{2}', $this.name, $this.value, $this.unit), $IcingaEnums.IcingaExitCode.Ok);
+        }
+    }
+
+    $Check | Add-Member -membertype ScriptMethod -name 'SilentCompile' -value {
+        $this.WriteUnitError();
+        $this.AddOkOutput();
+    }
+
+    $Check | Add-Member -membertype ScriptMethod -name 'Compile' -value {
+        param([bool]$Verbose = $FALSE);
+
+        if ($Verbose) {
+            Write-Host ($this.messages | Out-String);
+        }
+
+        $this.WriteUnitError();
+        $this.AddOkOutput();
+
+        return $this.exitcode;
+    }
+
+    return $Check;
+}
diff --git a/lib/icinga/checkresult/New-IcingaCheckPackage.psm1 b/lib/icinga/checkresult/New-IcingaCheckPackage.psm1
new file mode 100644
index 0000000..cbd3db9
--- /dev/null
+++ b/lib/icinga/checkresult/New-IcingaCheckPackage.psm1
@@ -0,0 +1,176 @@
+Import-IcingaLib icinga\enums;
+
+function New-IcingaCheckPackage()
+{
+    param(
+        [string]$Name,
+        [switch]$OperatorAnd,
+        [switch]$OperatorOr,
+        [switch]$OperatorNone,
+        [int]$OperatorMin = -1,
+        [int]$OperatorMax = -1,
+        [array]$Checks    = @()
+    );
+
+    $Check = New-Object -TypeName PSObject;
+    $Check | Add-Member -membertype NoteProperty -name 'name'      -value $Name;
+    $Check | Add-Member -membertype NoteProperty -name 'exitcode'  -value -1;
+    $Check | Add-Member -membertype NoteProperty -name 'checks'    -value $Checks;
+    $Check | Add-Member -membertype NoteProperty -name 'opand'     -value $OperatorAnd;
+    $Check | Add-Member -membertype NoteProperty -name 'opor'      -value $OperatorOr;
+    $Check | Add-Member -membertype NoteProperty -name 'opnone'    -value $OperatorNone;
+    $Check | Add-Member -membertype NoteProperty -name 'opmin'     -value $OperatorMin;
+    $Check | Add-Member -membertype NoteProperty -name 'opmax'     -value $OperatorMax;
+    $Check | Add-Member -membertype NoteProperty -name 'hasoutput' -value $TRUE;
+
+    $Check | Add-Member -membertype ScriptMethod -name 'Compile' -value {
+
+        Write-Host ([string]::Format('Check result for package {0} ({1}):{2}', $this.name, $this.GetPackageConfigMessage(), "`r`n"));
+
+        if ($this.opand) {
+            if ($this.CheckAllOk() -eq $FALSE) {
+                $this.GetWorstExitCode();
+            }
+        } elseif($this.opor) {
+            if ($this.CheckOneOk() -eq $FALSE) {
+                $this.GetWorstExitCode();
+            }
+        } elseif($this.opnone) {
+            if ($this.CheckOneOk() -eq $TRUE) {
+                $this.GetWorstExitCode();
+                $this.exitcode = $IcingaEnums.IcingaExitCode.Critical;
+            } else {
+                $this.WriteAllOutput();
+                $this.exitcode = $IcingaEnums.IcingaExitCode.Ok;
+            }
+        } elseif([int]$this.opmin -ne -1) {
+            if ($this.CheckMinimumOk() -eq $FALSE) {
+                $this.GetWorstExitCode();
+            } else {
+                $this.WriteAllOutput();
+                $this.exitcode = $IcingaEnums.IcingaExitCode.Ok;
+            }
+        } elseif([int]$this.opmax -ne -1) {
+            if ($this.CheckMaximumOk() -eq $FALSE) {
+                $this.GetWorstExitCode();
+            } else {
+                $this.WriteAllOutput();
+                $this.exitcode = $IcingaEnums.IcingaExitCode.Ok;
+            }
+        }
+
+        if ($this.hasoutput -eq $FALSE) {
+            Write-Host $IcingaEnums.IcingaExitCodeText.($this.exitcode);
+        }
+
+        return $this.exitcode;
+    }
+
+    $Check | Add-Member -membertype ScriptMethod -name 'SilentCompile' -value {
+        $this.Compile() | Out-Null;
+    }
+
+    $Check | Add-Member -membertype ScriptMethod -name 'GetOkCount' -value {
+        [int]$okCount = 0;
+        foreach ($check in $this.checks) {
+            if ([int]$check.exitcode -eq [int]$IcingaEnums.IcingaExitCode.Ok) {
+                $okCount += 1;
+            }
+        }
+
+        return $okCount;
+    }
+
+    $Check | Add-Member -membertype ScriptMethod -name 'CheckMinimumOk' -value {
+        [int]$okCount = $this.GetOkCount();
+
+        if ($this.opmin -le $okCount) {
+            return $TRUE;
+        }
+
+        return $FALSE;
+    }
+
+    $Check | Add-Member -membertype ScriptMethod -name 'CheckMaximumOk' -value {
+        [int]$okCount = $this.GetOkCount();
+
+        if ($this.opmax -ge $okCount) {
+            return $TRUE;
+        }
+
+        return $FALSE;
+    }
+
+    $Check | Add-Member -membertype ScriptMethod -name 'CheckAllOk' -value {
+        foreach ($check in $this.checks) {
+            if ([int]$check.exitcode -ne [int]$IcingaEnums.IcingaExitCode.Ok) {
+                return $FALSE;
+            }
+        }
+
+        return $TRUE;
+    }
+
+    $Check | Add-Member -membertype ScriptMethod -name 'CheckOneOk' -value {
+        foreach ($check in $this.checks) {
+            if ([int]$check.exitcode -eq [int]$IcingaEnums.IcingaExitCode.Ok) {
+                if ($check.messages.Count -ne 0) {
+                    Write-Host ($check.messages | Out-String);
+                } else {
+                    $this.hasoutput = $FALSE;
+                }
+                $this.exitcode = $check.exitcode;
+                return $TRUE;
+            }
+        }
+
+        return $FALSE;
+    }
+
+    $Check | Add-Member -membertype ScriptMethod -name 'GetPackageConfigMessage' -value {
+        if ($this.opand) {
+            return 'Match All';
+        } elseif ($this.opor) {
+            return 'Match Any';
+        } elseif ($this.opnone) {
+            return 'Match None';
+        } elseif ([int]$this.opmin -ne -1) {
+            return [string]::Format('Minimum {0}', $this.opmin)
+        } elseif ([int]$this.opmax -ne -1) {
+            return [string]::Format('Maximum {0}', $this.opmax)
+        }
+    }
+
+    $Check | Add-Member -membertype ScriptMethod -name 'WriteAllOutput' -value {
+        $printedOutput = $FALSE;
+        foreach ($check in $this.checks) {
+            if ($check.messages.Count -ne 0) {
+                Write-Host ($check.messages | Out-String);
+                $printedOutput = $TRUE;
+            }
+        }
+        if ($printedOutput -eq $FALSE) {
+            $this.hasoutput = $FALSE;
+        }
+    }
+
+    $Check | Add-Member -membertype ScriptMethod -name 'GetWorstExitCode' -value {
+        $worstCheck = $null;
+        foreach ($check in $this.checks) {
+            if ([int]$this.exitcode -lt $check.exitcode) {
+                $this.exitcode = $check.exitcode;
+                $worstCheck = $check;
+            }
+        }
+
+        if ($null -ne $worstCheck) {
+            if ($worstCheck.messages.Count -ne 0) {
+                Write-Host ($worstCheck.messages | Out-String);
+            } else {
+                $this.hasoutput = $FALSE;
+            }
+        }
+    }
+
+    return $Check;
+}
diff --git a/lib/icinga/checkresult/New-IcingaCheckResult.psm1 b/lib/icinga/checkresult/New-IcingaCheckResult.psm1
new file mode 100644
index 0000000..f5084cc
--- /dev/null
+++ b/lib/icinga/checkresult/New-IcingaCheckResult.psm1
@@ -0,0 +1,131 @@
+Import-IcingaLib icinga\enums;
+
+function New-IcingaCheckresult()
+{
+    $CheckResult = New-Object -TypeName PSObject;
+    $CheckResult | Add-Member -membertype NoteProperty -name 'HasResult'     -value $FALSE;
+    $CheckResult | Add-Member -membertype NoteProperty -name 'ExitCode'      -value -1;
+    $CheckResult | Add-Member -membertype NoteProperty -name 'OutputMessage' -value @();
+    $CheckResult | Add-Member -membertype NoteProperty -name 'PerfData'      -value @();
+
+    $CheckResult | Add-Member -membertype ScriptMethod -name 'Matches' -value {
+        param($match, $value, $message, [bool]$negate = $FALSE);
+
+        [string]$phrase = 'IS';
+        [int]$exitcode = $IcingaEnums.IcingaExitCode.Unknown;
+
+        if ($negate) {
+            if ($value -ne $match) {
+                $phrase = 'IS';
+                $exitcode = $IcingaEnums.IcingaExitCode.Ok;
+            } else {
+                $phrase = 'is NOT';
+                $exitcode = $IcingaEnums.IcingaExitCode.Critical;
+            }
+        } else {
+            if ($value -ne $match) {
+                $phrase = 'is NOT';
+                $exitcode = $IcingaEnums.IcingaExitCode.Critical;
+            } else {
+                $phrase = 'IS';
+                $exitcode = $IcingaEnums.IcingaExitCode.Ok;
+            }
+        }
+
+        $message = [string]::Format('{0} (Input value "{1}" {3} matching "{2}")', $message, $value, $match, $phrase);
+        $this.SetExitCode($exitcode);
+        $this.AddOutputMessage($message, $exitcode);
+    }
+
+    $CheckResult | Add-Member -membertype ScriptMethod -name 'Lower' -value {
+        param($warning, $critical, $value, $message);
+
+        [int]$exitcode = $IcingaEnums.IcingaExitCode.Unknown;
+
+        if ($value -ge $critical) {
+            $exitcode = $IcingaEnums.IcingaExitCode.Critical;
+        } elseif ($value -ge $warning) {
+            $exitcode = $IcingaEnums.IcingaExitCode.Warning;
+        } else {
+            $exitcode = $IcingaEnums.IcingaExitCode.Ok;
+        }
+
+        $this.SetExitCode($exitcode);
+        $this.AddOutputMessage($message, $exitcode);
+    }
+
+    $CheckResult | Add-Member -membertype ScriptMethod -name 'LowerEqual' -value {
+        param($warning, $critical, $value, $message);
+
+        [int]$exitcode = $IcingaEnums.IcingaExitCode.Unknown;
+
+        if ($value -gt $critical) {
+            $exitcode = $IcingaEnums.IcingaExitCode.Critical;
+        } elseif ($value -gt $warning) {
+            $exitcode = $IcingaEnums.IcingaExitCode.Warning;
+        } else {
+            $exitcode = $IcingaEnums.IcingaExitCode.Ok;
+        }
+
+        $this.SetExitCode($exitcode);
+        $this.AddOutputMessage($message, $exitcode);
+    }
+
+    $CheckResult | Add-Member -membertype ScriptMethod -name 'Greater' -value {
+        param($warning, $critical, $value, $message);
+
+        [int]$exitcode = $IcingaEnums.IcingaExitCode.Unknown;
+
+        if ($value -le $critical) {
+            $exitcode = $IcingaEnums.IcingaExitCode.Critical;
+        } elseif ($value -le $warning) {
+            $exitcode = $IcingaEnums.IcingaExitCode.Warning;
+        } else {
+            $exitcode = $IcingaEnums.IcingaExitCode.Ok;
+        }
+
+        $this.SetExitCode($exitcode);
+        $this.AddOutputMessage($message, $exitcode);
+    }
+
+    $CheckResult | Add-Member -membertype ScriptMethod -name 'GreaterEqual' -value {
+        param($warning, $critical, $value, $message);
+
+        [int]$exitcode = $IcingaEnums.IcingaExitCode.Unknown;
+
+        if ($value -lt $critical) {
+            $exitcode = $IcingaEnums.IcingaExitCode.Critical;
+        } elseif ($value -lt $warning) {
+            $exitcode = $IcingaEnums.IcingaExitCode.Warning;
+        } else {
+            $exitcode = $IcingaEnums.IcingaExitCode.Ok;
+        }
+
+        $this.SetExitCode($exitcode);
+        $this.AddOutputMessage($message, $exitcode);
+    }
+
+    $CheckResult | Add-Member -membertype ScriptMethod -name 'SetExitCode' -value {
+        param($exitcode);
+
+        # Only overwrite the exit code in case our new value is greater then
+        # the current one Ok > Warning > Critical
+        if ($this.ExitCode -gt $exitcode) {
+            return;
+        }
+
+        $this.ExitCode = $exitcode;
+    }
+
+    $CheckResult | Add-Member -membertype ScriptMethod -name 'AddOutputMessage' -value {
+        param($exitcode, $message);
+
+        $this.OutputMessage.Add(
+            [string]::Format(
+                '{0}: {1}',
+                $IcingaEnums.IcingaExitCodeText[$exitcode],
+                $message
+            )
+        )
+    }
+}
diff --git a/lib/icinga/enums.psm1 b/lib/icinga/enums.psm1
new file mode 100644
index 0000000..098cb80
--- /dev/null
+++ b/lib/icinga/enums.psm1
@@ -0,0 +1,46 @@
+<#
+ # This script will provide 'Enums' we can use within our module to
+ # easier access constants and to maintain a better overview of the
+ # entire components
+ #>
+
+[hashtable]$IcingaExitCode = @{
+    Ok        = 0;
+    Warning   = 1;
+    Critical  = 2;
+    Unknown   = 3;
+};
+
+[hashtable]$IcingaExitCodeText = @{
+    0 = 'Ok';
+    1 = 'Warning';
+    2 = 'Critical';
+    3 = 'Unknown';
+};
+
+[hashtable]$IcingaMeasurementUnits = @{
+    's'  = 'seconds';
+    'ms' = 'milliseconds';
+    'us' = 'microseconds';
+    '%'  = 'percent';
+    'B'  = 'bytes';
+    'KB' = 'kilobytes';
+    'MB' = 'megabytes';
+    'TB' = 'terabytes';
+    'c'  = 'counter';
+};
+
+<#
+ # Once we defined a new enum hashtable above, simply add it to this list
+ # to make it available within the entire module.
+ #
+ # Example usage:
+ # $IcingaEnums.IcingaExitCode.Ok
+ #>
+[hashtable]$IcingaEnums = @{
+    IcingaExitCode         = $IcingaExitCode;
+    IcingaExitCodeText     = $IcingaExitCodeText;
+    IcingaMeasurementUnits = $IcingaMeasurementUnits;
+}
+
+Export-ModuleMember -Variable @( 'IcingaEnums' );