Common notarial services include:-

1. certified true copy of document (eg. passport, educational certificate)
2. witnessing and attesting the execution of individuals (eg. sale and purchase agreement, statutory declaration, power of attorney, forms for overseas use)

Once you have identified the notarial services required, you should check whether any, some or all of the following documents/procedures are required by the Foreign Agency:-

1. Notarisation (notarization) by Notary Public, eg. witnessing or certified true copy
2. Notarial Certificate issued by Notary Public
3. Authentication by Singapore Academy of Law
4. Further Verfication by Ministry of Foriegn Affairs (MFA)
5. Legalisation (legalization) by Embassies / Consulates