Io utilizzerei senz'altro motor planning and execution.
Praxis, sebbene corretto, non si ritrova come tale nei referti ma è più un termine accademico.

Quindi:
Handwriting (skills): Motor planning and execution: ... etc.

Motor Planning and Execution.
The third component of handwriting is praxis or the ability to plan and execute motor actions or behavior
https://www.scribd.com/document/254291775/dysgraphia

What is planning and sequencing (praxis)?

Planning and sequencing involves planning and ordering new muscle (motor) actions (known as praxis). It involves first generating an idea of what you want to do (ideation), figuring out how you are going to do it (motor planning) and then doing or carrying out what you wanted to do (execution).
https://childdevelopment.com.au/areas-of-concern/organisatio...



Motor Planning: Praxis.

Motor planning or praxis is the ability of the brain to conceive, organize, and carry out a sequence of unfamiliar actions.
http://valeriedejean.org/uno12.html

http://occupationaltherapychildren.com.au/praxis-its-not-jus...

--------------------------------------------------
Note added at 6 hrs (2018-03-23 14:28:07 GMT)
--------------------------------------------------

E questa è una domanda di neurologia, più che pedagogia ;)

--------------------------------------------------
Note added at 6 hrs (2018-03-23 14:29:35 GMT)
--------------------------------------------------

PPS. Totally OFF topic ma è da tanto che volevo dirtelo...sorridi ogni tanto in queste foto che posti!! :))