Easiest Way to Assess Degree of Sales Success

Recently, I published an article that introduced a way to measure sales progress by means other than conventional numbers and metrics. 
Today, I received an email from a property leasing salesperson who had his own question about sales effectiveness.  He asked, “How do I determine if I am seeing results from me being a good salesman or if it’s from my sheer volume and what kind of selling would you say a Real Estate Salesperson uses most?”
I explained that there are four types of sales conversations and by conducting some self-analysis you can determine whether success or failure is the result of your own effectiveness, or because of your company’s reputation, quality and features of your product or service, the timing of your conversation, or that you happen to have the lowest price.