Information on the series edition: Computer science is closely aligned with the curriculum through its action-oriented concept and the arrangement of the content. The textbook follows a tool-independent approach and treats tool knowledge separately from document structures. Computer science can be used flexibly, independent of programs used in class or quickly changing versions of common standard software. The new edition builds on its predecessor, Ikarus, and features the following special highlights: The pupil's book has been extended by around 40 pages of competence-oriented tasks. The tasks are marked with symbols that indicate certain competence expectations, including research, networking, communicating, cooperating, working creatively, modeling, analyzing, discovering, solving using a computer, solving without a computer, and reflecting, explaining.