Strategies, written by Brian Abbs and Ingrid Freebairn, was a communicative language course first published by Longman in 1975. Officially dubbed a “functional-notional”, the series was based on four coursebooks.
In their acknowledgements, the authors expressly acknowledged the pioneering work of David Wilkins in the communicative approach to language teaching and quoted him as follows: "What people want to do through language is more important than the mastery of language as an unapplied system."
Ease of use by teachers
Quality of the authentic texts/listening