Implementation and control: consist in the series of activities that must be performed in order to run the marketing plan in accordance to the objectives set by the marketer. At this stage, it is critical to gain the support of all members if the organization, especially when the marketing plan is due to affect the organization from its grounds.
When I ask entrepreneurs and small business owners, it is not unusual for not having any marketing plan. I once read that Sir Richard Branson never had any marketing plan when he started the 1st Virgin business many years ago. In fact in one study of entrepreneurship (I couldn't recall the name of the study) was that as much as 50% of entrepreneurs and business owners don't have a business plan and marketing plan when they first started the business.