The etymology and historical meaning of the term professional is from Middle English, from profes , adjective, having professed one's vows, from Anglo-French, from Late Latin professus , from Latin, past participle of profitēri to profess, confess, from pro- before + fatēri to acknowledge; in other senses, from Latin professus , past participle. Thus, as people became more and more specialized in their trade, they began to 'profess' their skill to others, and 'vow' to perform their trade to the highest known standard. With a reputation to uphold, trusted workers of a society who have a specific trade are considered professionals. Ironically, the usage of the word 'profess' declined from the late 1800s to the 1950s, just as the term 'professional' was gaining popularity from 1900-2010. 
Some “Pathos” but emphasis is on “Logos ”—Appeal to logical reasoning and evidence (., Facts, Examples, Historical and Legal Precedents) “Ethos”—Appeal to writer’s or speaker’s character, credentials, trustworthiness “Ethos”— Appeal to writer’s or speaker’s credibility (more so than character); credibility is established through knowledge of subject matter and merits of reasons and factual evidence Persuasive texts may make an “argument,” but they don’t always include elements of a formal argument Include the following elements of Argument: Warrants (Statements about How Evidence Supports Claims) Backing (Support for Warrants) May not take opposing views into account Counterclaim (Opposing Argument) Rebuttals (Respond to and Try to Refute) Heart of Critical Thinking The Online Writing Lab (OWL) at Purdue University is also a helpful resource for getting started with this type of writing, among other things. Writing at the next level for our students whether for college or for life, is argumentative. I would argue that all writing is argumentative — creating a solid thesis, and then defending it with evidence is an invaluable skill. We should know why we think what we think and be able to support that, not only with emotion, but with evidence.
A good visualization can communicate the nature and potential impact of information and ideas more powerfully than any other form of communication. For a long time “dataviz” was left to specialists–data scientists and professional designers. No longer. A new generation of tools and massive amounts of available data make it easy for anyone to create visualizations that communicate ideas far more effectively than generic spreadsheet charts ever could. What’s more, building good charts is quickly becoming a need-to-have skill for managers. If you’re not doing it, other managers are, and they’re getting noticed for it and getting credit for contributing to your company’s success. In “Good Charts,” dataviz maven Scott Berinato provides an essential guide to how visualization works and how to use this new language to impress and persuade.