Le duc d'Albe (its original French title) or Il duca d'Alba (its later Italian title) is an opera in three acts originally composed by Gaetano Donizetti in 1839 to a French language libretto by Eugène Scribe and Charles Duveyrier.
 Its title, which translates as "The Duke of Alba", refers to its protagonist Fernando Álvarez de Toledo, 3rd Duke of Alba.
 The work was intended for performance at the Paris Opéra.
 However, William Ashbrook notes that "Rosine Stoltz, the director's mistress, disliked her intended role of Hélène and Donizetti put the work aside when it was half completed"
Panda3D is a game engine that includes graphics, audio, I/O, collision detection, and other abilities relevant to the creation of 3D games.
 Panda3D is free software under the revised BSD license.
The Grumman XSBF, also known by the company designation G-14, was an American biplane scout bomber developed by Grumman Aircraft for the United States Navy during the 1930s.
 Derived from Grumman's successful "Fifi" fighter, the aircraft was developed at a time when the biplane was giving way to the monoplane.
 In competition against other aircraft it proved to possess inferior performance in its intended role, and did not enter production.
 The sole prototype went on to serve as a liaison aircraft, as well as being used in experiments by NACA, before being destroyed in a crash in 1939.
János Pásztor (born 1955) is a Hungarian diplomat, the Senior Adviser to the Secretary-General on Climate Change.
 He joined his current role in January 2016 at the request of United Nations Secretary-General Ban Ki-moon.
 Prior to his current role he was Assistant Secretary-General on Climate Change in the Executive Office of the Secretary-General of the United Nations in New York City.
 He was appointed Assistant Secretary-General in January 2015 after taking leave of absence from the World Wide Fund for Nature International where he was Policy and Science Director and acting Director for Conservation.
Tank classification is a taxonomy of identifying either the intended role or weight class of tanks.
 The classification by role was used primarily during the developmental stage of the national armoured forces, and referred to the doctrinal and force structure utility of the tanks based on design emphasis.
 The weight classification is used in the same way truck classification is used, and is intended to accommodate logistic requirements of the tanks.
The Peter principle is a concept in management theory formulated by educator Laurence J. Peter and published in 1969.
 It states that the selection of a candidate for a position is based on the candidate's performance in their current role, rather than on abilities relevant to the intended role.
 Thus, employees only stop being promoted once they can no longer perform effectively, and "managers rise to the level of their incompetence".
The Siemens-Schuckert Forssman was a prototype bomber aircraft designed and built in Germany in 1914 and 1915.
 When its performance proved inadequate for its intended role, even after numerous modifications, the German Inspectorate of Flying Troops (the "Idflieg") eventually accepted it into service as a trainer.
 Shortly after its acceptance into military service, the aircraft's fuselage fractured while on the ground, ending its career.
 The aircraft is sometimes known as the Siemens-Schuckert Forssman R, the "R" alluding to the designation that the "Idflieg" assigned to multi-engine aircraft in late 1915.
 However, the Forssman did not meet all the criteria of the "R" designation — for example, its engines were not serviceable in flight — and the "R" designation only came into use after the Forssman was built.
 If the Forssman received any military designation at all, that designation is not now known.
Preselection is the process by which a candidate is selected, usually by a political party, to contest an election for political office.
 It is also referred to as candidate selection.
 It is a fundamental function of political parties.
 The preselection process may involve the party's executive or leader selecting a candidate or by some contested process.
 In countries that adopt Westminster-style responsible government, preselection is also the first step on the path to a position in the executive.
 The selected candidate is commonly referred to as the party's endorsed candidate.
Laurence Johnston Peter (September 16, 1919 – January 12, 1990) was a Canadian educator and "hierarchiologist" best known to the general public for the formulation of the Peter principle.
The 1924 Democratic presidential primaries were part of the selection process by which voters of the Democratic Party chose its nominee for President of the United States in the 1924 U.S. presidential election.
 The concept of a primary election, where any registered party member would vote for a candidate, was relatively new in the American political landscape.
 In only 12 states were actual primaries held, and even in those the results were not universally binding for the delegates to the Democratic National Convention, where the presidential candidate would be formally chosen.
 In most of the country, the selection of delegates was confined to state-level conventions and caucuses, under the heavy hand of local political machines. Though William Gibbs McAdoo won a vast majority of states, and much more than half of the popular vote, in those twelve states that held primary elections, it meant little to his performance nationwide.
 Many of the delegations from states that did "not" hold primary elections favored his main rivals, Oscar Underwood of Alabama and Al Smith of New York, neither of which won any primary elections.
 As well, the primaries that McAdoo did not win were won by "local sons" who stood no chance of winning the nomination, or in some cases were not even formal candidates.
 Once at the convention, the party was deadlocked for 102 straight ballots, before dark horse candidate John W. Davis, (who was not a formal candidate when he arrived at the convention) was chosen on the 103rd ballot.
 Davis went on to lose the election to Republican candidate Calvin Coolidge.

Question: Which hierarcchiologist believed It states that the selection of a candidate for a position is based on the candidate's performance in their current role, rather than on abilities relevant to the intended role?
Answer: Laurence J. Peter