For inviting asymptomatic women aged 50 to 69 with an average risk of breast cancer (in whom screening is strongly recommended) to attend organised population-based screening programmes, the ECIBC's Guidelines Development Group (GDG) suggests:

• using a letter followed by an SMS notification (conditional recommendation, high certainty of the evidence)
• using a letter followed by an automated phone call (conditional recommendation, very low certainty of the evidence)

If these strategies are not available, the GDG suggests either:

• an e-mail (conditional recommendation, low certainty of the evidence)
• or an automated phone call alone (conditional recommendation, moderate certainty of the evidence).

Finally, the GDG suggests not using a letter followed by a personalised phone call (conditional recommendation, very low certainty of the evidence).