Example of how not namespacing your variables can make it easier to maintain

SassMeister-input-HTML.html

<div class="module">
<p>This is an example of using namespaced variables</p>
</div>

<div class="box">BOX</div>

SassMeister-input.scss

// ----
// Sass (v3.3.0.rc.1)
// Compass (v0.13.alpha.10)
// ----

// config/_base.scss

$base-font-size: 18px;
$module-base-font-size: 11px;
$box-base-font-size: 25px;

// component/module.scss

$base-font-size: 50px !default;

// component/box.scss

$base-font-size: 10px !default;

.module p {
  font-size: $module-base-font-size;
}

.box {
  background: red;
  color: white;
  font-size: $box-base-font-size;
  width: 100px;
  height: 100px;
}

SassMeister-output.css

.module p {
  font-size: 11px;
}

.box {
  background: red;
  color: white;
  font-size: 25px;
  width: 100px;
  height: 100px;
}

SassMeister-rendered.html

<div class="module">
<p>This is an example of using namespaced variables</p>
</div>

<div class="box">BOX</div>