diff --git a/eng/build.ps1 b/eng/build.ps1
index e811cf6db27d7b..42677b1c7e6ddb 100644
--- a/eng/build.ps1
+++ b/eng/build.ps1
@@ -2,15 +2,15 @@
 Param(
   [switch][Alias('h')]$help,
   [switch][Alias('t')]$test,
-  [string[]][Alias('c')]$configuration = @("Debug"),
+  [ValidateSet("Debug","Release","Checked")][string[]][Alias('c')]$configuration = @("Debug"),
   [string][Alias('f')]$framework,
   [string]$vs,
-  [string]$os,
+  [ValidateSet("Windows_NT","Unix")][string]$os,
   [switch]$allconfigurations,
   [switch]$coverage,
   [string]$testscope,
   [switch]$testnobuild,
-  [string[]][Alias('a')]$arch = @([System.Runtime.InteropServices.RuntimeInformation]::ProcessArchitecture.ToString().ToLowerInvariant()),
+  [ValidateSet("x86","x64","arm","arm64")][string[]][Alias('a')]$arch = @([System.Runtime.InteropServices.RuntimeInformation]::ProcessArchitecture.ToString().ToLowerInvariant()),
   [Parameter(Position=0)][string][Alias('s')]$subset,
   [ValidateSet("Debug","Release","Checked")][string][Alias('rc')]$runtimeConfiguration,
   [ValidateSet("Debug","Release")][string][Alias('lc')]$librariesConfiguration,
diff --git a/eng/build.sh b/eng/build.sh
index 36e68ef1c1dc42..02c5d278e259d6 100755
--- a/eng/build.sh
+++ b/eng/build.sh
@@ -107,6 +107,7 @@ while [[ $# > 0 ]]; do
       usage
       exit 0
       ;;
+
      -subset|-s)
       if [ -z ${2+x} ]; then
         arguments="$arguments /p:Subset=help"
@@ -116,23 +117,46 @@ while [[ $# > 0 ]]; do
         shift 2
       fi
       ;;
+
      -arch)
       if [ -z ${2+x} ]; then
         echo "No architecture supplied. See help (--help) for supported architectures." 1>&2
         exit 1
       fi
-      arch=$2
+      passedArch="$(echo "$2" | awk '{print tolower($0)}')"
+      case "$passedArch" in
+        x64|x86|arm|armel|arm64|wasm)
+          arch=$passedArch
+          ;;
+        *)
+          echo "Unsupported target architecture '$2'."
+          echo "The allowed values are x86, x64, arm, armel, arm64, and wasm."
+          exit 1
+          ;;
+      esac
       shift 2
       ;;
+
      -configuration|-c)
-     if [ -z ${2+x} ]; then
+      if [ -z ${2+x} ]; then 
         echo "No configuration supplied. See help (--help) for supported configurations." 1>&2
         exit 1
       fi
-      val="$(tr '[:lower:]' '[:upper:]' <<< ${2:0:1})${2:1}"
+      passedConfig="$(echo "$2" | awk '{print tolower($0)}')"
+      case "$passedConfig" in
+        debug|release|checked)
+          val="$(tr '[:lower:]' '[:upper:]' <<< ${passedConfig:0:1})${passedConfig:1}"
+          ;;
+        *)
+          echo "Unsupported target configuration '$2'."
+          echo "The allowed values are Debug, Release, and Checked."
+          exit 1
+          ;;
+      esac
       arguments="$arguments -configuration $val"
       shift 2
       ;;
+
      -framework|-f)
       if [ -z ${2+x} ]; then
         echo "No framework supplied. See help (--help) for supported frameworks." 1>&2
@@ -142,19 +166,47 @@ while [[ $# > 0 ]]; do
       arguments="$arguments /p:BuildTargetFramework=$val"
       shift 2
       ;;
+
      -os)
       if [ -z ${2+x} ]; then
         echo "No target operating system supplied. See help (--help) for supported target operating systems." 1>&2
         exit 1
       fi
-      os=$2
-      arguments="$arguments /p:TargetOS=$2"
+      passedOS="$(echo "$2" | awk '{print tolower($0)}')"
+      case "$passedOS" in
+        windows_nt)
+          os="Windows_NT" ;;
+        linux)
+          os="Linux" ;;
+        freebsd)
+          os="FreeBSD" ;;
+        osx)
+          os="OSX" ;;
+        tvos)
+          os="tvOS" ;;
+        ios)
+          os="iOS" ;;
+        android)
+          os="Android" ;;
+        browser)
+          os="Browser" ;;
+        sunos)
+          os="SunOS" ;;
+        *)
+          echo "Unsupported target OS '$2'."
+          echo "The allowed values are Windows_NT, Linux, FreeBSD, OSX, tvOS, iOS, Android, Browser, and SunOS."
+          exit 1
+          ;;
+      esac
+      arguments="$arguments /p:TargetOS=$os"
       shift 2
       ;;
+
      -allconfigurations)
       arguments="$arguments /p:BuildAllConfigurations=true"
       shift 1
       ;;
+
      -testscope)
       if [ -z ${2+x} ]; then
         echo "No test scope supplied. See help (--help) for supported test scope values." 1>&2
@@ -163,40 +215,68 @@ while [[ $# > 0 ]]; do
       arguments="$arguments /p:TestScope=$2"
       shift 2
       ;;
+
      -testnobuild)
       arguments="$arguments /p:TestNoBuild=true"
       shift 1
       ;;
+
      -coverage)
       arguments="$arguments /p:Coverage=true"
       shift 1
       ;;
+
      -runtimeconfiguration|-rc)
       if [ -z ${2+x} ]; then
         echo "No runtime configuration supplied. See help (--help) for supported runtime configurations." 1>&2
         exit 1
       fi
-      val="$(tr '[:lower:]' '[:upper:]' <<< ${2:0:1})${2:1}"
+      passedRuntimeConf="$(echo "$2" | awk '{print tolower($0)}')"
+      case "$passedRuntimeConf" in
+        debug|release|checked)
+          val="$(tr '[:lower:]' '[:upper:]' <<< ${passedRuntimeConf:0:1})${passedRuntimeConf:1}"
+          ;;
+        *)
+          echo "Unsupported runtime configuration '$2'."
+          echo "The allowed values are Debug, Release, and Checked."
+          exit 1
+          ;;
+      esac
       arguments="$arguments /p:RuntimeConfiguration=$val"
       shift 2
       ;;
+
      -librariesconfiguration|-lc)
       if [ -z ${2+x} ]; then
         echo "No libraries configuration supplied. See help (--help) for supported libraries configurations." 1>&2
         exit 1
       fi
-      arguments="$arguments /p:LibrariesConfiguration=$2"
+      passedLibConf="$(echo "$2" | awk '{print tolower($0)}')"
+      case "$passedLibConf" in
+        debug|release)
+          val="$(tr '[:lower:]' '[:upper:]' <<< ${passedLibConf:0:1})${passedLibConf:1}"
+          ;;
+        *)
+          echo "Unsupported libraries configuration '$2'."
+          echo "The allowed values are Debug and Release."
+          exit 1
+          ;;
+      esac
+      arguments="$arguments /p:LibrariesConfiguration=$val"
       shift 2
       ;;
+
      -cross)
       crossBuild=1
       arguments="$arguments /p:CrossBuild=True"
       shift 1
       ;;
+
      -clang*)
       arguments="$arguments /p:Compiler=$opt"
       shift 1
       ;;
+
      -cmakeargs)
       if [ -z ${2+x} ]; then
         echo "No cmake args supplied." 1>&2
@@ -205,10 +285,12 @@ while [[ $# > 0 ]]; do
       cmakeargs="${cmakeargs} ${opt} $2"
       shift 2
       ;;
+
      -gcc*)
       arguments="$arguments /p:Compiler=$opt"
       shift 1
       ;;
+
       *)
       extraargs="$extraargs $1"
       shift 1