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function ConvertTo-Boolean
{
  param
  (
    [Parameter(Mandatory=$false,ValueFromPipeline=$true)][string] $value
  )
  switch ($value)
  {
    "y" { return $true; }
    "yes" { return $true; }
    "true" { return $true; }
    "t" { return $true; }
    1 { return $true; }
    "n" { return $false; }
    "no" { return $false; }
    "false" { return $false; }
    "f" { return $false; } 
    0 { return $false; }
  }
}