Ken Langdon has a background in sales and marketing in the technology industry. As an independent consultant, he has trained salespeople and sales manager in the United States, Europe, and Australia, and has advised managers on the coaching and the appraisal of their staff. He has also provided strategic guidance for companies, including Hewlett Packard. Ken is the author of books for DK and coauthor of several Essential Managers titles, including Putting Customers First. He is also one of the authors of DK’s Successful Manager’s Handbook.Andy Bruce is the founder and chief executive of Softools—a UK-based business solutions company. He has worked with clients in both the public and private sectors to enable senior management visibility and control, and sustained performance improvement. He has coauthored several DK Essential Managers books, including Project Management and Strategic Thinking. He is also an affiliate lecturer at Henley Management College.