Physicaltechnical prior competencies of engineering students
 Stefan Behrendt^{1}Email author,
 Elmar Dammann^{1}Email author,
 Florina Ștefănică^{1}Email author,
 Bernd Markert†^{2} and
 Reinhold Nickolaus†^{1}
https://doi.org/10.1186/s4046101500139
© Behrendt et al.; licensee Springer. 2015
Received: 20 August 2014
Accepted: 15 January 2015
Published: 15 February 2015
Abstract
Background
This article addresses the question of which physicaltechnical prior competencies students in Germany start their engineering studies with. Furthermore, it analyzes the influence of e.g. formal qualifications, curricular weights in school, or participation in preparatory courses on these prior competencies.
Methods
Using a sample of 2345 students, we modelled the structure of competencies and conducted proficiency scaling. Furthermore, we computed ttests and analyses of variance in order to analyze the physicaltechnical prior competencies’ dependency on education biographies, gender, participation in propaedeutic courses etc.
Results
Our results reveal a threedimensional structure for the physicaltechnical prior competencies as most suitable. Additionally, we find a big variance in the physicaltechnical prior competencies. Students with a general entrance qualification, male students, students attending universities, students having had many physics lessons in school and students having participated in preparatory courses in physics achieve better results.
Conclusions
Summing up, the results of our survey reveal a big variance in the physicaltechnical prior competencies. Hence, we find a substantial proportion of freshmen with significant competency deficits. We assume that these competency deficits constitute a factor which makes (the beginning of) engineering studies more difficult.
Keywords
Background
Numerous preparatory courses are currently offered for engineering studies. These courses aim at closing students’ knowledge gaps and creating sufficiently solid contentrelated bases for successfully mastering studies. Offers on mathematical knowledge and abilities are especially widespread (e.g. Bausch et al. 2014). There is strong evidence for the fact that prior competencies have a great influence on the development of competencies within the course of studies (e.g. Hell et al. 2007). It is however unclear (a) which competencies students really have in the beginning of their studies and (b) to which extent gender, type of institution of higher education, course of studies, information on the type of higher education entrance qualification as well as preparatory courses are relevant for the prior physicaltechnical competencies of engineering studies.
Against this background, this article addresses the question of which physicaltechnical prior competencies students in Germany start their engineering studies with. Furthermore, it analyzes the influence of e.g. formal qualifications, curricular weights^{a} in school, or participation in preparatory courses on these prior competencies.
State of research
Structure of competencies and proficiency scaling
Results from large scale assessments below academic level suggest that multidimensional models are most suitable for representing the structure of competencies in the beginning of studies and document relatively high correlations between the subcategories of competency at the same time (e.g. Klieme et al. 2001). However, studies in the industrialtechnical field below academic level show that in the beginning of apprenticeship, unidimensional models of technical competencies are better fitting to the data than multidimensional ones (Geißel 2008; Gschwendtner 2008). It seems therefore uncertain whether a multi or a unidimensional model of the physicaltechnical prior competencies is more adequate. In the case that subdimensions are separable, we expect the differentiation to occur along content domains or along basics of the specific field (an overview in Nickolaus and Seeber 2013). Mechanics, which were primarily used for the design of the test for measuring physicaltechnical prior competencies, have two main curricular foci within the school curricula: statics and dynamics. These two potential subdimensions are characterized both by differing conceptual ideas and by differing cognitive requirements. Compared to statics, in the context of dynamics we also consider changes that occur over time; hence, situations are more complex and mathematical models which are needed for solving dynamic problems are more complex, too. The classification in statics and dynamics is also preferred in relevant educational books on Engineering Mechanics (e.g. Gross et al. 2012).
Proficiency scaling in technical fields below the academic level results in the following features which are predictive for the development of competencies: cognitive requirement (e.g. subsequent to Bloom 1956), complexity,^{b} independent modelling requirement, item formats, curricular foci respectively referencing qualities of data books allowed in the solving process (Geißel 2008; Gschwendtner 2008; Nickolaus et al. 2012). Mathematical requirements are partially explanatory as well (Seeber 2008).
Predictors of study success
The grades of the General Qualification for University Entrance (Abiturgrades) are the best predictors for study success (Schuler and Hell 2008). Their predictive power can, however, be increased by subjectspecific tests at the beginning of the study phase. Against this background, subjectspecific tests are additionally used in the international context for estimating future study success. To some extent (e.g. in Sweden and Japan (Thunsdorf and Schmitt 2013)), tests for the general aptitude for higher educational studies are conducted too. Admission procedures to higher education partly consult grades on special subjects or previous professional experience, the latter having hardly any prognostic power for study success (Nickolaus and Abele 2009). The prognostic validity of special school grades varies depending on the field of study as well. Abiturgrades in mathematics as well as global Abiturgrades reach higher prognostic validities in fields of study as mathematics, science, and engineering sciences than in linguistics or cultural studies (Trapmann et al. 2007).
Numerous surveys from various fields of education indicate the great importance of subjectspecific prior knowledge for the development of competencies (e.g. Stern 2001). In studies, which analyzed the relation between general intelligence, (subject) specific prior knowledge, and training success, the high predictive power of the prior knowledge furthermore becomes obvious (Abele 2014; SchmidtAtzert et al. 2004; Schuler and Höft 2006). In the nonacademic field, surveys that analyze the impact of prior cognitive abilities, motivational features, and quality features of vocational education on the development of professional competencies reveal the great importance of the subjectspecific prior knowledge (Abele 2014; Nickolaus et al. 2010, 2012). The relevance of the prior cognitive abilities and especially of the subjectspecific prior knowledge is hereby decidedly illustrated.
On the contrary, the findings on the attained levels of prior knowledge are rather scarce. Subjectspecific entry tests are used to some extent by several institutions of tertiary education, but IRTbased modelling is not being conducted, as far as we know. Consistent data across types of institutions of higher education is also missing. Largescale assessments below academic level give a good overview of the attained competency levels of the whole population. In the field of tertiary education however, it is an open question to what extent selfselection and external selection lead to systematical differences between the students of the different courses of studies. Effects of selfselection seem overall plausible, effects of external selection seem especially plausible in the case of performanceoriented admission procedures, some of them considering subjectspecific grades as well.
The effects of the numerous propaedeutic offers, which are meanwhile available at a broad level in the beginning phase of study, are not known.
Subsequent to existing studies, we assume that the type of higher education entrance qualification becomes relevant for the attained levels of the prior competencies. Furthermore, the survey TOSCA indicates that graduates of technical gymnasia in BadenWürttemberg achieve similar performance levels in mathematics and physics as graduates of general gymnasia in other federal states in Germany (Neumann et al. 2009).
It is an open question whether gender effects will be observed. On the one hand, largescale assessments below the academic level document performance advantages for male respondents in mathematics and physics. On the other hand, it seems obvious that such differences are compensated by selfselection and external selection before entering the study phase. The performance levels documented within the existing studies justify the expectation of great genderspecific differences despite selfselection and external selection processes (Baumert et al. 2001). Regarding this, it shall be verified empirically whether the students entering engineering studies reach the levels fixed in the curricula of the general school system. The assumption that significant proportions of students do not reach them is very probable, as substantial efforts are currently being made in order to assure that the freshmen have the ability to keep up to tertiary education through subjectspecific or more general propaedeutic preparatory courses.
Methods
The results presented in this article originate from a wideranging study on the modelling and measurement of competencies and their development within engineering studies. This survey aims at generating competency models for the main basic subjects on the one hand and explanatory models on the other hand. The overall project is laid out in a longitudinal section and involves machine engineering and construction engineering studies within two types of institutions of higher education: universities and universities of applied sciences. The contribution at hand shows results of the competency test in the area of technicalphysical prior knowledge at the beginning of engineering studies, which was carried out in the winter semester 2012/2013.
The sample consists of 2345 students (1996 universities, 233 universities of applied sciences) from ten locations in Germany (6 universities and 4 universities of applied sciences). The access to the field was extremely difficult: We contacted many universities and universities of applied sciences asking for permission to carry out our survey with their students, getting many refusals. At some of the participating locations we managed to collect data from the total population, at other locations we encountered significant losses because students refused to participate. For this reason, we do not claim representativeness. Thus, the following results should be seen as first approach in this field. Further studies with representative samples should prove whether these results can be validated.
The test in the area of physical technical prior knowledge at the beginning of engineering studies was designed according to the curricula of the junior high school and senior high school of general schools, focusing especially on contents which are relevant for the subject Engineering Mechanics within machine engineering and construction engineering studies (Hindenach 2012). Experts in the field of Engineering Mechanics were consulted about the test – they consider the test items require knowledge which should be built up in school and therefore, if present, supports students in successfully mastering their engineering studies.
In addition to this contentrelated testing, the following data, which was assumed to be relevant for the level of prior physicaltechnical competencies, was collected: educational biography (attended type of school, number of physics lessons), performance in school, participation in propaedeutic offers at the beginning of studies, general cognitive abilities, and mathematical competencies, motivation for mathematics and physics in school. The IQ was measured using the CFT scale 3 form A part 1 (Weiß and Cattell 1971, see also Cattell 1961). The test for measuring mathematical competencies was developed and piloted within the framework of this research project in cooperation with the department of mathematics education of the IPN Kiel^{c} – for information on this test see Hauck (2012) and Neumann et al. (2014). The motivation for mathematics and physics in school was collected using an instrument from Prenzel et al. (1996), which was adapted for this context^{d}.

H1: Students with general university entrance qualification and many physics lessons in school outclass students with a restricted entrance qualification (university of applied science entrance qualification, subjectspecific entrance qualification) and fewer physics lessons in matters of physicaltechnical prior knowledge.

H2: Participants in the preparatory courses in the runup to the beginning of studies are more highcapacity than nonparticipants.

H3: Genderspecific differences in the physicaltechnical prior knowledge cannot be observed.

H4: No significant differences in the physicaltechnical prior knowledge of construction engineering students and machine engineering students are found.

H5: However, differences between students in universities and students in universities of applied sciences are expected.

H6: General cognitive abilities and mathematical competencies are predictive for the physicaltechnical prior knowledge.

H7: The difficulty features from other technical and scientific domains are explanatory for the proficiency scaling of the physicaltechnical prior knowledge.
Additionally, the following question is to be answered:
Q1: Is a multidimensional or a unidimensional structure more adequate for the modelling of the physicaltechnical prior knowledge of engineering students?
Results and discussion
Results on the structure of competencies and the proficiency scaling of the physicaltechnical prior competency are first presented. Afterwards, explanatory factors for the attained levels of the physicaltechnical competency are shown.
Modelling of the technicalphysical prior competencies
Structure of competencies
Items for the two content dimensions statics and dynamics (see above) were developed in a first step. Following the wish of experts in the field of Engineering Mechanics, further items were developed, requiring the application of fundamental principles of Engineering Mechanics. In our view, this group of items is theoretically describable through conceptual knowledge (RittleJohnson and Siegler 1998). Differentiations according to criteria of cognitive psychology (types of knowledge) hardly exist in the nonacademic field: Until now, only Pittich (2013) claims to have separated conceptual knowledge from other types of knowledge^{e}.
Fundamental principles have crosssituational importance and are often taught only implicitly in institutional contexts. In schools, especially in scientific and technical fields, teachers often mainly focus on specific procedures respectively specific approaches for solving types of problems. Fundamental principles are developed in various contexts and, in some cases, are based on everyday experience^{f}. Barriers may arise when fundamental principles have to be applied; in familiar contexts, however, their application may happen routinely. As a consequence, conceptual knowledge is related to problem solving according to Dörner (1976) respectively to schema creation according to Bendorf 2002(, see also Rumelhart and Norman 1981). For collecting conceptual knowledge, we introduce the dimension “basic ideas” with the following working definition:
For us, basic ideas on Engineering Mechanics represent general ideas about interdependencies of Engineering Mechanics systems. These ideas are based on knowledge from different contexts and individual experience and have to be applied to the particular tasks in Engineering Mechanics.

A onedimensional model

A twodimensional model with the subcategories “curricular” and “basic ideas”. “Curricular” covers valid subjects across schools and “basic ideas” covers basic mechanical concepts that do not necessarily have to be dealt with in all school types and locations^{g}.

A threedimensional model, where the subcategory “curricular” was further divided into the subcategories “statics” and “dynamics”.
EMe_e: reliability
Reliability  3dim.  2dim.  1dim.  

Statics  Dynamics  Basic ideas  Curricular  Basic ideas  
EAP/PVRel.  .58  .65  .55  .64  .55  .66 
WLERel.  .58  
Number of items  5  9  6  14  6  20 
The correlation between statics and dynamics seems plausible. However, the strong correlation differences between the three dimensions remain unclear. We can exclude that the low correlation between statics and basic ideas is a consequence of test construction, i.e. of curricular focus within the “basic ideas”, because static problems are also explicitly addressed within the “basic ideas” dimension.
Proficiency scaling
The proficiency scaling was conducted subsequent to Hartig (2007) for a unidimensional model; it was not possible to implement proficiency scaling for a multidimensional model because of the relatively small number of items.

Requirement level (reproduction, establishing of connections, generalization, and reflection).

Type of knowledge (declarative, procedural).

Sketch (yes, no): This feature includes both sketches contained in the item formulations, which have to be read, interpreted, and/or understood for correctly solving the items or sketches as part of the respondents’ answers.

Units (yes, no): It is categorized here whether the solution requires working with measurement units.

Mathematics (yes, no): This feature indicates whether mathematical methods or concepts are needed for the solution.
Multivariate regression analysis for the explanation of item difficulty
Variable  Category  β  p 

Requirement level  Reproduction  Ref  
Establishing of connections  .44  .05  
Generalization and reflection  .56  <.05  
Type of knowledge  Declarative  Ref  
Procedural  .40  .05  
Sketch  No  Ref  
Yes  .34  .07  
Units  No  Ref  
Yes  .31  .09  
Mathematics  No  Ref  
Yes  .27  .21  
Model  F (6;14) = 5.022  <.01 
The following other features were considered as well, but proved not to be relevant for item difficulty: number of solution steps, calculating with numbers or variables, occurrence or creating of charts, and reference quality of data books.
Hypothesis 7 is supported only partially. We replicated the predictive power of the following features for item difficulty: cognitive requirement levels, relevance of mathematical requirements, and item formats (sketches). The number of solution steps proves to be nonpredictive. The type of knowledge proves to be explanatory as well, in contrast to the results documented in other technical fields (Nickolaus et al. 2011).
The competency level model contains three levels that can be described qualitatively. For the sake of completeness of the proficiency scaling procedure (Hartig 2007), we list here two further levels. It is useful to merge these two levels for interpretation purposes; further studies have to show whether these two levels are actually separable. The detailed description of the competency levels is presented in the following.
Respondents on levels < I and I are not able solve the simplest mechanical items. A detailed description of the abilities on these levels is not possible because of the shortage of items.
From a practical perspective, this means that teachers in higher education cannot expect a relatively large part of their students to master the basic technicalphysical contents from general school. Hence this knowledge has to be developed or updated. A solid physicaltechnical prior knowledge may not even be attested for students on level II. Altogether, approximately 80% of the students do not have a solid physicaltechnical prior knowledge.
The following section clarifies whether the two types of institutions of higher education are affected by this phenomenon to the same extent and whether there are specific groups that are particularly affected by it. For this purpose, we will verify hypothesis 1–6 and simultaneously examine other connections.
Prior competencies’ dependency on education biographies, gender, general cognitive and mathematical abilities, participation in propaedeutic courses, and domainspecific motivation
The physicaltechnical entry competencies´ dependency on type of institution of higher education, course of studies, gender, participation in preparatory courses
Variable  Level  Cohens d 

Type of institution of higher education (N = 2306)  University of applied sciences (9,5%) University (90,5%)  0.169** 
Course of studies (N = 2181)  Construction engineering (8,5%) Mechanical engineering (91,5%)  0.541*** 
Gender (N = 298)  Male (87,5%)  female (12,5%)  −0.378* 
Preparatory course in mathematics (N = 293)  No (49%)  yes (51%)  −0.161 
Preparatory course in physics (N = 293)  No (89%)  yes (11%)  0.410* 
Other preparatory course (N = 293)  No (95%)  yes (5%)  0.113 
The physicaltechnical entry competencies’ dependency on education biographies, general cognitive abilities, performance data from school, motivation
Variable  Level  η ^{ 2 } 

Year of birth (N = 296)  0.024**  
Type of higher education entrance qualification (N = )  General entrance qualification (68,5%)  0.027* 
University of applied sciences entrance qualification (10%)  
Subjectspecific entrance qualification (21%)  
Special regulation (0,5%)  
Year of higher education entrance qualification (N = 295)  0.004  
Final grade of the higher education entrance qualification (N = 293)  1.01.5 (9%)  1.62.2 (45,5%)  0.123*** 
2.32.9 (34,5%) 3.03.6 (11%)  
>3.6 (0%)  
Number of mathematics lessons per week (senior high school) (N = 292)  0 (1,5%) 1–2 (3,5%)  0.001 
3–4 (67,5%)  >4 (27,5%)  
Type of final examination in mathematics (N = 291)  Both (6%)  none (4%)  0.039** 
Oral (1,5%)  written (88,5%)  
Grade of final examination in mathematics (N = 287)  1.01.5 (29,5%)  1.62.2 (30,5%)  0.117*** 
2.32.9 (16,5%)  3.03.6 (17,5%)  >3.6 (6%)  
Number of physics lessons per week (senior high school) (N = 294)  0 (17%)  1–2 (19%)  0.104*** 
3–4 (42%)  >4 (22%)  
Type of final examination in physics (N = 291)  Both (3,5%)  none (55%)  0.046** 
Oral (1,5%)  written (40%)  
Grade of final examination in physics (N = 231)  1.01.5 (24,5%)  1.62.2 (32,5%)  0.092*** 
2.32.9 (24%)  3.03.6 (14%)  >3.6 (5%)  
Federal state of higher education entrance qualification (N = 289)  bw (78%) by (4%)  hs (1%)  nrw (15%)  0.021 
ns (1%)  rp (1%)^{l}  
Type of school of higher education entrance qualification (N = 291)  AG (54,5%)  ber.G (2%)  FS (2,5%)  0.096*** 
int.GS (2%)  OS/KO (27%)  TG (9%)  
other (3%)^{m}  
Intrinsic/identified motivation mathematics (N = 283)  0.014*  
Intrinsic/identified motivation physics (N = 247)  0.047***  
Mathematical competency (N = 315)  0.207***  
Intelligence (N = 531)  0.074*** 
We found relatively strong differences in the physicaltechnical competencies depending on the course of studies, the participation in preparatory courses in physics, and the gender: mechanical engineering students, male respondents, and students having participated in preparatory courses in physics achieve much better results. This means that hypotheses H3 and H4 are falsified. H2 is, however, supported, whereby the preparatory course in physics is especially relevant. It seems interesting here that the preparatory course in physics is frequented more seldom than the preparatory course in mathematics.
For a more detailed representation of the effect sizes presented in Tables 3 and 4 we depicted selected connections using boxplots (with means and standard deviations). The width of each box represents the proportion of the respondents in the respective category referred to the total number of respondents. The whiskers represent the span.
We find various numbers of respondents in the categories of type of higher education entrance qualification (Figure 8), however the differences are not as big as in the case of the type of institution of higher education or the course of studies. The approximate equality between the students with a subjectspecific entrance qualification and a university of applied sciences entrance qualification (d = 0.03; n.s.) is evident, as well as the big performance difference of the students having achieved the general entrance qualification (d = −0.37; p < .1 compared to the students having achieved a subjectspecific entrance qualification, respectively d = −0.34; p < .01 compared to the students having achieved a university of applied sciences entrance qualification).
Conclusions
The results of our survey reveal a big variance in the physicaltechnical prior competencies. Hence, we find a substantial proportion of freshmen with significant competency deficits. We assume that these competency deficits constitute a factor which makes (the beginning of) engineering studies more difficult.
The hypotheses, which indicate a difference in the physicaltechnical competencies caused by formal entrance requirements for tertiary education, were confirmed, where the differences only exist between students with general entry qualification on the one hand and subjectspecific entrance qualification and university of applied sciences entry qualification on the other hand. For respondents with university of applied sciences entrance qualification, which is usually acquired in “short forms”, we assume lower curricular weights of the education in physics than for respondents with a general entrance qualification.
The differences in the physicaltechnical prior knowledge, depending on the number of physics lessons the students had in school proves to be remarkably high. The participation in the preparatory course in physics, which provides further learning opportunities, shows relatively strong advantages for the students having participated. We should point out here that the test for measuring the physicaltechnical prior knowledge addresses primarily subjects which are situated in the junior high period of regular school and hence there is a long period of time between the acquisition of the knowledge and the moment of testing.
The performance differs between the two types of institution of higher education, whereat students from universities have better physicaltechnical prior competencies than students from universities of applied sciences. Our finding is expectationconformal, because these different types of institutions of higher education have different entry requirements: especially for freshmen of universities of applied sciences we find a lesser percentage of general higher education entry qualifications and even technicians are allowed to start their engineering studies here (see also Jürgens and Zinn 2012, Zinn 2012).
The performance also differs between the two courses of study: we find advantages for mechanical engineering students compared to construction engineering students. This finding is expectationconformal too, because mechanical engineering studies are very attractive in Germany: mechanical engineering is an especially innovative field, the labor market conditions for mechanical engineers are excellent and mechanical engineering has a good image, as it is the supporting pillar of the German export economy.
We find a multidimensional structure for the physicaltechnical competencies in the beginning of engineering studies as most suitable. The subcategories “statics” and “dynamics” are primarily distinguished along content domains. Furthermore, we find the subcategory “basic ideas“, representing general ideas about interdependencies of Engineering Mechanics systems. These ideas are based on knowledge from different contexts and individual experience and have to be applied to the particular tasks in Engineering Mechanics. We further computed other models, which the theoretical bases are not yet well enough differentiated for. Mathematical requirements e.g. are generating structure here. We experience that the basic ideas are stable across all computed models. Further studies with an extended item pool have to show whether the found competency structure and the operationalization of the basic ideas will be replicated.
Considering matters of education policy, the curricular weights provide an option for heading to the desired levels of prior competencies. This applies to the number of physics lessons in school and to the participation in preparatory courses in physics, both showing considerable effects. As the different entrance qualifications are accompanied by differing curricula in school and, at the same time, the different entrance qualifications have relatively strong effects on the levels of the prior competencies, it needs to be ascertained which possibilities exist to create conditions in the respective contexts that are more conducive to the development of the required competencies. In the academic teaching, strengthening the preparatory courses in physics is a possible solution, as they seem less frequented than the preparatory courses in mathematics. Changes in the curricula of the physics lessons in the different school types should turn out to be more challenging, because of the confrontation with competing ideas concerning the subjects. It remains to be seen whether the need for action, which finds expression in the achieved competency levels presented above, is sufficient for taking appropriate actions.
Endnotes
^{a}Curricular weights can be generated in two ways: on the one hand by the provision of relevant learning offers and on the other hand by the different contentrelated foci of the subject.
^{b}Complexity is determined e.g. by the number of relevant elements which have to be taken into consideration in the solving process as well as their linking or by the number of steps towards the solution (Nickolaus et al. 2012; see also Kauertz 2008).
^{c} http://www.ipn.unikiel.de/en/theipn/departments/mathematicseducation.
^{d}Cronbach’s alpha for the motivation for physics is 0,87; Cronbach’s alpha for motivation for mathematics is 0,75.
^{e}The attempt to empirically separate declarative and procedural knowledge using paperpenciltests does normally not succeed (Gschwendtner 2008, Geißel 2008).
^{f}For example: How does the bending line of a bar look like?
^{g}An expert rating confirmed our assumption according to which items belonging to the dimension “basic ideas” are only little represented in the school curriculum and it is necessary to apply fundamental principles of Engineering Mechanics for solving them.
^{h}3 dim: AIC 36766, BIC 36915; 1 dim: AIC 37001, BIC 37122; χ^{2} (5) = 246; p < .001.
3 dim: AIC 36766, BIC 36915; 2 dim: AIC 33877, BIC 37010; χ^{2} (3) = 118; p < .001.
^{i}Hauptschule is a type of secondary school in Germany, starting after elementary schooling, and offering Lower Secondary Education. Any student who went to a German elementary school can go to a Hauptschule afterwards, whereas students who want to attend a Realschule or Gymnasium need to have good marks in order to do so (Wikipedia).
^{j}Realschule is a type of secondary school in Germany (Wikipedia).
^{k}Some authors call this effect size Hedges g (e.g. Bühner 2011, pp. 268).
^{l}bw = BadenWürttemberg, by = Bayern, hs = Hessen, nrw = NordrheinWestfalen, ns = Niedersachsen, rp = Rheinland Pfalz.
^{m}AG = general high school, ber.G = vocational high school, FS = vocational and technical school, int.GS = integrated comprehensive school, OS/KO = Oberschule/Kolleg (type of institution for adult education in Germany for attaining a higher education entrance qualification), TG = technical secondary school.
Notes
Declarations
Authors’ Affiliations
References
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