The best way to prevent a wasteful repetition of work is by consistently using an organizational system that weaves together paper files, research notes, to do lists, evidence located, and conclusions reached. This incredibly simple, yet very successful organizational system has been successfully used by thousands of genealogists. With this system, the essential evidence and its supportive explanations are located in a safe retrievable place, available for constant re-examination. This frees the mind to focus on a new hypothesis, to creatively compile a life-time of work, or to calmly summarize your work for others. In fact, this organizational system makes the entire research process more efficient.