Pen & paper. It helps me getting away from the drive to 'just give it a shot' and forces me to work so much more structured. I still love to doodle with a pen

Pen & paper. It helps me getting away from the drive to 'just give it a shot' and forces me to work so much more structured. I still love to doodle with a pen and different color markers and it allows me to have it permanently in view on my desk with the option to add boxes and arrows as required.