The book ?A Study of Professional Communication? aims to serve as a comprehensive textbook for introductory course of professional communication Part one. The content has been designed according to the new syllabus of U.P.T.U. First unit deals with the different aspects of Technical Communication. Features; Distinction between General and Technical Communication; Language as a Tool of Communication; Levels of Communication: Interpersonal, Organizational, Mass Communication; The Flow of Communication: Downward, Upward, Lateral or Horizontal (Peer group); Importance of Technical Communication; Barriers to Communication. Second unit deals with grammatical part as; Words and Phrases: Word formation. Synonyms and Antonyms; Homophones; Select vocabulary of about 500-1000 New words; Requisites of Sentence Construction: Paragraph Development: Techniques and Methods-Inductive, Deductive, Spatial, Linear, Chronological etc. The Art of Condensation-various steps. Third unit deals with Business Letters: Sales and Credit Letters; Letter of Enquiry; Letter of Quotation, Order, Claim and Adjustment Letters; Job Application and Resumes. Official Letters: D.O. Letters; Govt. Letters, Letters to Authorities etc. Reports: Types; Significance; Structure, Style & Writing of Reports. Technical Proposal; Parts; Types; Writing of Proposal; Significance. Technical Paper, Project. Dissertation and Thesis Writing: Features, Methods & Writing. Fourth unit deals with; Defining Purpose; Audience & Locale; Organizing Contents; Preparing Outline; Audio-visual Aids; Nuances of Delivery; Body Language; Space; Setting Nuances of Voice Dynamics; Time-Dimension. Fifth unit deals with Essays; following essays form the suggested text book with emphasis on Mechanics of writing.