Some dates in the timetable are compulsory for all of the participating countries. The beginning of the competition and the deadline for submitting the national winner poster(s) to the ISLP website are the same for all countries. Otherwise, the timetable is indicative and the participating countries may apply it the way they choose.
| Phases of competition | Dates | ISLP Director | Country Coordinator and national organizing committee | ISLP Advisory Board/ISLP Executive | Teachers/students | ISI |
| Nomination of members for national organising committees by country coordinator | As soon as possible | | X | | | |
| Rules, instructions, internet registration form, call for competition | 1.2.2024 | X | | X | | |
| Finding sponsors/funding for national competition | As soon as possible | | X | | | |
| Finding sponsors/funding for international competition | As soon as possible | X | X | X | | X |
| Translation of rules and instructions from English into native languages | As soon as possible | | X | | | |
| Marketing of competition | 15.1.2024 – | X | X | X | X | X |
| Closing date for competition | 20.4.2025 | X | | | | |
| Summary of participants to ISLP Executive/Advisory Board/Jury | By 4.5.2025 | X | | | | |
| Preparing posters | 1.2.2024 – 20.4.2025 | | | | X | |
| Judging posters in schools/locally/regionally | Country dependent | | | | X | |
| Submitting the best poster to national committees | Country dependent | | | | X | |
| Signing up students in the national competition by informing the country coordinator | Country dependent | | | | X | |
| Judging posters in national organising committees or in separate valuation committee | Country dependent | | X | | | |
| Organising a poster display and a national award ceremony | Country dependent | | X | | | |
| Nominating the international judging committee | By March 2025 | X | | X | | |
| Submitting the best posters of each country to the ISLP website | Opens late April, closes 23 May 2025 | | X | | | |
| Judging posters (international final) | Electronic meeting in May–June 2025 | | | X | | |
| Organising a poster display at ISI2025 meeting (at least winning poster, second and third runner up) | During the ISI2025 meeting | X | | X | | X |
| Announcing and awarding the international winners | During the ISI2025 meeting | X | X | X | | X |
