<p>Depends on what the ECs are. Do you mean something like:</p>
<ul>
<li>Summer or co-op job or internship.</li>
<li>Job relevant to your major while in school.</li>
<li>Research in your major.</li>
<li>Writing a useful and well known open source free software program.</li>
<li>Engineering competition like the concrete canoe or solar car challenge, or math/science competition like Putnam.</li>
</ul>
<p>Or stuff like campus clubs, fraternities and sororities, intramural sports, etc.?</p>