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.)
The probate laws of most states in the U.S. prohibit an adoptee from automatically inheriting from his or her birth parents. This applies regardless of whether or not the birth father participated in or agreed to the adoption. Had the adoption not have taken place, any son or daughter would be an heir upon his or her father's death—regardless of who his childhood caretakers were. There can be additional complications if the birth father has subsequently moved to another state. Should a birth parent include an "unknown" adoptee in his or her will, the probate court has no obligation to fulfill this type of request, while "known" adoptees may have the same status as non-family members. However, there is some variation in probate laws from one state to another.
Although practices vary state by state, most adoptions start with the birth mother reviewing dozens of adoption profile books  or online profiles of prospective adoptive parents. Usually, these are adoptive families who have retained that agency or attorney to assist them in the adoption process. Most US states permit full openness not just regarding identities, but also personal information about each other. Just as the adoptive parents want to learn about the birth mother's life and health history, so does the birth mother want the same information about the people she is considering as the parents for her child.
Unfortunately, there are situations where an open adoption is either not an option or is not the best choice for the child. Some birth parents do not want an open adoption because they are afraid that the ongoing contact will be a constant reminder of the painful decision they made at a difficult time in their life. They may believe that a closed adoption will better allow them to emotionally heal. Other birth parents have not shared the fact of their pregnancy with their family or community and they may fear that an open adoption will undermine their desire for confidentiality. Finally, there are times when open adoption is not in the child’s best interest due to the birth parents’ circumstances.
On June 1, 2009, Ontario, Canada, opened its sealed records to adoptees and their birth parents, with a minimum age of 18 for the adoptee, or one additional year if the birth parents initiate the request. Both parties can protect their privacy by giving notice of how to be either contacted or not, and if the latter, with identifying information being released or not. All adoptions subsequent to September 1, 2008, will be "open adoptions"
Before the 1980s, most adoptions were kept closed. This is because women who go through unexpected pregnancy simply relocate while pregnant, give birth and then return to their homes. The doctor or an agency then looks for an adoptive family for the child without the mother knowing. This kind of setup can bring about a lot of complications and confusion within the adoptive family, particularly on the adopted child.
Open adoption, sometimes called fully disclosed adoption, refers to a continuum of options that enables the birth parents and adoptive parents to have information about and communication with one another before placement, after placement, or both. Open adoption may include the exchange of communication between birth and adoptive parents that includes letters, emails, telephone calls, text messages and/or face-to-face visits. Regardless of the level of openness in adoption, open adoption is based on relationships — and, like all relationships, the people involved grow, change, and evolve over time.
For both birth parents and adoptive parents, the open adoption process can remove the mystery from the adoption process, and can permit a greater degree of control in the decision-making process. The open adoption process also allows adoptive parents to better answer their children's questions about who their birthparents were, and why they were adopted. Open adoptions can also help the child come to terms with being adopted, because the child's concerns can be addressed directly by everyone who was involved in the adoption process.
Oftentimes the birth and adoptive parents will sign a Post-Adoption Contract (sometimes called an Open Adoption Agreement), putting in writing any promises regarding contact after the adoption is finalized. Even in those states which do not expressly have laws in this area, these agreements can usually be prepared if the parties desire to formalize the agreement. In an increasing number of US states, courts will find these agreements legally enforceable, as long as they serve the best interests of the child. It is not unusual for these agreements to be more like "handshake" agreements, although they offer less protection to a birth parent if the adoptive parent's promises were not honored.
A 1996 study reported in Child Development found that all the children studied “reported positive levels of self-esteem, curiosity about their birthparents, and satisfaction with the openness situation” regardless of whether their adoptions were closed, semi-open, or open. What this seems to mean is that the child's sense of security in his adoptive family is more important than contact with the birth family.