Work package 1 develops the programme extensions and individualisation of the orthography app HOT-T (Handwritten Orthographic Training on a tablet). In parallel, a database will be implemented which can autonomously handle analysis functions, recurrent error  feedback and individualised adjustments of the training material with respect to error type, vocabulary, frequency of word type, training duration etc. The work package 2 explores the field implementation at 4 primary schools with 10 tablets each. This will be performed in one school year lasting from July 2019 until July 2020. The work package 3 realises the evaluation, adaptation and analysis of the long term applicability with the primary school.