In an open adoption, as I define it, the adopters and the birthparents both know each other's full names, both first and last names. (It is not open if only one side has identifying information about the other.) They may agree to exchange photos and letters directly, without using the agency or attorney as a middleman. Sometimes a semi-open adoption later becomes an open adoption, if both parties decide that they want it that way.
Usually, semi-open refers to an adoption in which the adopters and birthparents meet once or twice and on a first-name-only basis. In addition, they may agree to exchange pictures and letters on an annual or fairly infrequent basis through the adoption arranger. (If your adoption arranger advocates a semi-open adoption, be sure to ask for an exact definition of her terms.)
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Most open adoptions lie somewhere in the middle, according to Grotevant and McRoy, exchanging letters, pictures, and phone calls, and having face-to-face meetings once or twice a year. Whatever their situation, many families report that relatives and friends condemn openness, and voice fears that the arrangement will make the birth parent want the child back.