Augmented Reality (AR) gains increased attention as a

means to provide assistance for different human activities.

Hereby the suitability of AR does not only depend on the

respective task, but also to a high degree on the respective

device. In a standardized assembly task, we tested

AR-based in-situ assistance against conventional pictorial

instructions using a smartphone, Microsoft HoloLens and

Epson Moverio BT-200 smart glasses as well as paper-based

instructions. Participants solved the task fastest using the

paper instructions, but made less errors with AR assistance

on the Microsoft HoloLens smart glasses than with

any other system. Methodically we propose operational

definitions of time segments and other optimizations for

standardized benchmarking of AR assembly instructions.