Abstract
Process of planning the time is one of the crucial parts of any project, especially when it assumes many long-term activities. Thus, it was decided to check whether primary school pupils are able to schedule the activities specified in the project with the use of Gantt diagram, which is commonly used in commercial projects, however it is not popular in a school practice.
The research was carried out among primary school pupils in grades 6, 7 and 8, aged 12-14. Research revealed that the Gantt diagram is a very good tool for planning project activities for older pupils who have already reached stage 4 of development according to Piaget.
For younger pupils, more teacher support is needed.