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This is my summary how to make problems technology compatible:

• Include the graphing capabilities for additional tasks - forcing visualization.
• Encourage and ask for numerical and graphical solutions, ask for more than one way of solution, accept heuristic methods, encourage and ask for "Try and Error Methods".
• Let the pupils produce self made tools and give opportunities to apply them.
• Provoke functional thinking.
• Find the problem to presented solutions.
• Let the pupils set up conjectures - but also ask sometimes for the proofs.
• Include the various ways of the CAS´ output into the task, interpret the output and compare with calculation by hands, make the CAS built-in simplification rules to a mathematical subject.
• Use the CAS-capabilities for additional questions (and keep staying within the curriculum!!)
• But over all take care that you don´t give problems which set the calculator in the center of the problem, we should remain guided by mathematics and not by the manual.