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The book describes, rationalizes, and selectively illustrates the RMM Approach, where the continued availability of the legacy system capabilities is necessary over the sequence of modernization increments. While the approach is illustrated through an incremental transformation of a legacy COBOL-based system to a Java-based derivative, the RMM Approach is nevertheless applicable to other modernization problems or technologies. Moreover, the book does an exceptionally good job of interweaving explanations with examples. These examples are modest but salient and revealing, thereby avoiding unwarranted detail or distractions.
The advocated approach is at once both architecture-centric and component-centric. Architecture centricity captures and sustains a rather specific vision of the as-desired system, and the associated target architecture provides a stable reference over the various modernization activities. Component centricity enables the identification, analysis, grouping, and ultimate realization of system elements that are allocated to the respective modernization increments. Overall then, the target architecture establishes the initial and termination points of a modernization project, and the componentization installments determine the actual redevelopment trajectory connecting the project end points.
For me, the most intriguing, innovative, and vital parts of the approach appear under the RMM activities labeled Define Modernization Strategy and Reconcile Strategy with Stakeholder Needs (Chapters 13-15 and Chapter 16, respectively). Basically, the modernization strategy provides a systematic approach to delineating, analyzing, and grouping modernization elements through an examination of the legacy system implementation, subject to project constraints and certain prior higher-level technical decisions. Then, the finalization of element groupings into sequential increments is determined using programmatic preferences of the various stakeholders. This two-stage definition of modernization increments is driven prominently by cost and risk considerations, as well as by programmatic and technical factors. Ultimately, the designated increments establish waypoints on the aforementioned redevelopment trajectory, thereby identifying interim architectural configurations that facilitate closure on the target architecture, while simultaneously maintaining user capabilities during the modernization effort.
In all, 'Modernizing Legacy Systems' is a readable, coherent, illuminating, and surprisingly broad treatment of a vital topic. Hopefully, the RMM Approach or variants thereof will see widespread use in industry, thereby exploiting "a systematic and fact-based method that avoids arbitrary, intuitive decision making..."
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Charlie Montgomery has loved Blythe Bonniwell for years, since they attended school together. But Charlie has always been poor and shy, and despite earning honors in academics and athletics, considers himself beneath the beautiful, wealthy Blythe. But on the eve of his departure for a dangerous war mission, he gathers his courage and visits her, to tell her that he has always loved her, and to say goodbye.
Blythe's family has always been conservative church-goers, kind and generous, raising her in love although not in personal faith. But because of her loving nature and her upbringing, she is able to recognize the purity of Charlie's love, and with wonder and sincerity, she returns his affections with an innocent passion. Charlie is surprised, overjoyed and in utter despair--he had volunteered for a mission that he will most likely never return from. Because his mother is dead, he thought he had nothing to return for, and his patriotism and courage made him ideal for such a suicide assignment. But now, with Blythe's love following him to the continent, his entire outlook has changed and he wonders what will happen to them. They exchanged no vows, no engagement plans--Charlie does not expect to ever see her again.
Meanwhile, on the homefront, Blythe busies herself with Red Cross work and befriends Mrs. Blake, a woman from the "other side of town", who also has a son in the army, Walter. While many of the other women ignore or scorn the woman and her poverty, Blythe makes her feel welcome and enjoys her company. Her friendship rewards itself, for Walter Blake has befriended his hometown hero Charlie on the other side of the world, and is able to send a last message from Charlie to his beloved through Mrs. Blake.
But Dan Seavers, a rich, spoiled classmate of Blythe and Charlie, is courting Blythe with careless yet single-minded attentions. He is the colorful, harsh portrait of selfishness that the "modernism" of the world has wrought in the younger generation, denigrating the "old-fashioned-ness" of faith in God and love and respect. Blythe thinks of Dan as nothing but a childhood playmate, but he is persistent in his pursuit. Meanwhile, another of Blythe's classmates, Anne, pursues Dan just as avidly as he chases Blythe, and her petty jealousy blankets Blythe's optimism and hope with mocking scorn and despair.
On the war front, Charlie has gone to listen to a travelling speaker, Link Silverthorn, who convicts Charlie of the sin he had never acknowledged he had, and who also brings to his eyes a vision of Christ that moves and awakens him. Silverthorn answers Charlie's questions and introduces him to the love in the eyes of his Savior, and the *recognition* Charlie sees in the face of Jesus brings him hope and peace as he sets off for certain death. Charlie is comforted by the deep-seated knowledge that he *belongs* to Christ, and that God has mapped out his steps, and is also watching over the precious girl he has left at home.
Dan Seavers is threatening Blythe's parents with an elopement, still conceitedly unaware that Blythe does not return his so-called affections. The people of the town make known their own opinions, but a letter from Charlie arrives in the midst of the fray, describing his new-found awareness of Christ, and Blythe and her parents are themselves changed by the joy and sincerity of his words.
But Dan Seavers is still lurking, Anne is still grasping and catty... And then Charlie is missing in action...
I love this book and hope you will, too. Grace Livingston Hill is a master with words that bring to life the goodness of Christ, the blazing glory of real love, and the hope that sustains in the midst of war.
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