It is beneficial to decide on a target journal during the very early stages of writing an article, rather than first preparing an article and then considering where to send it. Analyse potential journals and choose one. Write your article with your target journal in mind. This is useful because different journals have different perceptions of science as well as differing opinions on how articles ought to be written. By writing directly for your target journal, you will ensure the right type of approach and speed up your writing process. If you wish to be even wiser, you may also.
