The Borussia Dortmund was a very impressive team that played at a high pace, had a nice style and flexibility, which Jurgen Klopp led to two German championships, a cup and a Champions League final in 2013.
Borussia was a very attacking team as during the game many of its players shifted forward with one full-back always participating in the attack. The main key points during the attack were the creation and exploitation of empty space, quick combination (simple and complex) play in the attacking third and finally fast positive transitions.
During the attacking phase, Borussia under Klopp's guidance, tried to control the pace not only through possession but also through fast negative transitions, which allowed them to immediately regain possession.

Athanasios Terzis presents a complete and extensive analysis of Borussia Dortmund under the guidance of Jurgen Klopp, which includes diagrams and detailed explanations.
The analysis was used to create 16 complete coaching units (75 exercises) that include functional exercises, game patterns, possession games, transition games, zone games with or without opponents, game situations, and games in restricted spaces.