French to English Tech/Engineering Construction / Civil Engineering Temporary workers for the construction industry

I am translating a brochure for a Portuguese company that provides temporary workers to companies in the CONSTRUCTION industry.

On the page in question, there is a table which has three columns:

column 1 - lists the different occupational categories of construction worker that this company can supply e.g. Coffreur-boiseur, Conducteur de machines / de grues, Maçon / Finisseur, Soudeur, Plâtrier, Chef d'équipe, etc.
column 2 - is headed "Diplômé". "Oui" appears for some of the jobs
column 3 - is headed "Obs." (which I am taking to mean "Notes"). The letter (a) appears alongside these jobs only:
Coffreur-boiseur
Conducteur de machines / de grues
Maçon / Finisseur
Soudeur
Chef d'équipe

Immediately under the table, there is the following key to the table which has me really puzzled:

(a) Connaissances en lecture de projet, à spécifier

I don´t understand what "lecture de projet" refers to and would be grateful for any ideas you have. It´s clearly some skill that only these workers have. No idea what though. I don´t have any more context I´m afraid.

Thanks in advance!