本論文的目的，在探討管理當局自願性公布財務預測及修正其資訊的有用性，或資訊內涵。所謂管理當局自願性揭露，意指其在大眾媒體上自願性地披露年度盈餘預測之謂。管理當局是財務資訊的主要生產者，其所生產之預測資訊具內部資訊優越性，是以投資人會以為這項資訊，對公司年度實際盈餘的瞭解有極大助益。若盈餘是有用的資訊，研究其預測資訊的準確度（是否具優越性）與資訊的有用性，將有助於公司管理當局在公告預測時的動機與市場如何使用盈餘預測資訊來進行投資決策，以及公司管理當局是否會利用這項資訊，進行股價操縱的行為。據此，本研究主要探討自願性財務預測相對於其實際盈餘的準 確度或修正幅度與方向，俾據以為檢查自願性預測與股價的關係。由於自願性預測均公布在媒體上，故本研究亦探討自願性揭露在專業性與非專業性媒體所代表之準確度與股價反應，俾瞭解媒體在自願性揭露中所扮演的角色。研究期間是以民國八十年度至八十三年度的資料作為分析的對象。結果顯示，自願性管理當局的揭露具資訊內涵，且專業性媒體上所披露者較非專業性媒體有用性為高。

一、中文部分
林鎮邦，台灣地區股票上市公司公布之財務報表所含情報量之研究，國立台灣大學商學研究所未出版碩士論文，民國六十八年六月。
余尚武，台灣證券市場股票上市公司盈餘宣告所合資訊內容之研究，國立台灣大學商學研究所未出版碩士論文，民國七十五年六月。
曾詳琳，季盈餘公告對股票成交量影響之研究，成功大學工業管理研究所未出版碩士論文，民國七十八年六月。
吳安妮博士，經理人員自願揭露盈餘預測資訊給外界之決定因素實證研究，國立政治大學會計評論，民國八十年二月第25期，1-24頁。
陳志愷，盈餘反應係數探索性之研究一台灣股票市場之實證分析，政治大學會計研究所碩士論文，民國八十二年六月。
吳麗紅，年度盈餘資訊效率性之探討，政治大學會計研究所碩士論文，民國八十二年六月。

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