This book is a timely go-to resource for any professionals wishing to communicate with the growing number of readers whose first language is not English. It highlights the potential language difficulties these readers face, and provides guidelines and tools for overcoming them. The guidelines show how to convey complicated information clearly without affecting the integrity of the subject matter, while the practical ‘before’ and ‘after’ examples clearly illustrate how using these guidelines and improves scientific texts. The book also includes text evaluation tools that allow writers to rapidly assess the readability of their materials. It is based on theory and the authors’ extensive experience in producing highly readable English texts for L2 readers who struggle with materials that were originally prepared for L1 readers.