^ Bergs, J; Hellings, J; Cleemput, I; Zurel, Ö; De Troyer, V; Van Hiel, M; Demeere, JL; Claeys, D; Vandijck, D (Feb 2014). "Systematic review and meta-analysis of the effect of the World Health Organization surgical safety checklist on postoperative complications". The British Journal of Surgery. 101 (3): 150–8. doi:10.1002/bjs.9381. PMID 24469615.
Special Unicode Characters in Data Validation Lists: ☐, ☑, ✓, ✔ - This may be my favorite approach. You can include special characters like this in a Data Validation drop-down list. This isn't quite as good as clicking once to fill in a checkbox, but it is great for the mobile Excel apps. The only hard part is remembering how to insert a check mark symbol in Excel. For more information, see my article Using Unicode Character Symbols in Excel.
Besides including products that are in a promotion, include products which are best sellers or even featured. You can even add a list of products which are suitable for your customer. This can be achieved in a number of ways; you can select products manually or automate the selection based on a different criteria (i.e. “customers also purchased…”).

Of course, you will ‘sell’ this offer with professional sales copy, some great headlines, and maybe even some bullet points. But the general idea here is to introduce yourself to this new cold traffic visitor, let them know what you are about, let them know that you can help them, and convince them that the first step to solving their problem is to opt-in to your free offer. 
Building a loyal community isn’t just about installing a forum or starting a closed Facebook group and calling it a day. It’s about making your members feel like they’re a part of something bigger than themselves, making them feel like their part of an elite or inner circle, making them feel special and valued, and giving them a sense of belonging. And this checklist shows you how to do all of this and more!
Excessive dependence of checklists may hinder performance when dealing with a time-critical situation, for example a medical emergency or an in-flight emergency. Checklists should not be used as a replacement for common sense. Intensive training including rote-learning of checklists can help integrate use of checklists with more adaptive and flexible problem solving techniques.[citation needed]
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