How to Write and Speak Effective English by Edward Frank Allen is a practical English-language guide originally published in 1938 and later issued in revised and abridged editions. The book focuses on improving both written and spoken English by explaining the difference between effective and ineffective usage and identifying common mistakes that weaken communication. It covers areas such as grammar, word usage, spelling, pronunciation, punctuation, capitalization, and clear writing and speaking. Rather than being a conventional English-language textbook, it is designed as a practical handbook for developing stronger command of English and communicating ideas more precisely. The book is particularly useful for readers who want to improve their writing style, vocabulary, pronunciation, and overall communication skills.